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68 / 689 problems
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| # | Name | Tags | Difficulty | Solved by | |
|---|---|---|---|---|---|
| ✓ | rb_ch01_q001 | Two glass jugs (water and alcohol) Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q002 | Two bells ringing together Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q003 | Sum of integers 1 to 100 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q004 | Old style analogue clock falls off wall Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q005 | Twelve marbles, one different Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q006 | Inscribed circle in square in corner Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q007 | Bug in cubic room Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q008 | Married couples no children probability Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q009 | 10x10x10 macro-cube micro-cubes Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q010 | Apples by truck or by railway Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q011 | Hour and minute hand angle Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q012 | First time after 3 PM when hour and minute hands meet Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q013 | 100 light bulbs and 100 stockbrokers Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q014 | 100 light bulbs continued Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q015 | Sock drawer pairs Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q016 | Competitive number-calling game Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q017 | Safe combination 40 brute force Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q018 | 90 coins one unusual minimum weighings Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q019 | Bounded entire complex function Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q020 | 10000 ants on ruler Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q021 | Lily pad doubling 30 days Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q022 | 27 lily pads in 6000 sq ft pond Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q023 | Decimal equivalents of 13/16 and 9/16 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q024 | Snail climbs 10-foot pole Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q025 | Three identical light fixtures three switches Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q026 | Five hats three blue two red Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q027 | Smallest positive integer with remainder pattern Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q028 | Motorcyclists fly between them Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q029 | Prove Heron's formula Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q030 | Nine integers ABCDEFGHI constraint Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q031 | Hotel rooms key drunk guests Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q032 | Boat rock pool water level Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q033 | Unfaithful husbands village Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q034 | Three poles 64 rings Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q035 | Solve ODE u''+u'+u=1 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q036 | Minimize variance aX+bY Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q037 | Lighthouse beam speed Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q038 | 20x20 chessboard cube pattern Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q039 | Running away from dog in field Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q040 | Prove integral of e^{-x^2} Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q041 | Integral of sec theta Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q042 | Infinite sum convergence Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q043 | Three children product 36 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q044 | Eight golf balls Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q045 | Sum k and k^3 from 1 to n Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q046 | 52 cards red one dollar each Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q047 | Quarter table covering game Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q048 | Chessboard dominoes corners removed Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q049 | p prime > 3 then p^2-1 divisible by 24 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q050 | Maximize firm value uniform Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q051 | String-like fuse 30 seconds with watch Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q052 | Two string-like fuses 45 seconds Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q053 | Walk one mile south east north end up at start Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q054 | Trailing zeros 100! Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q055 | 10 regions tax cheat scale Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q056 | Seven gold bars two cuts Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q057 | 99 distinct integers missing one Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q058 | Mirror flip horizontal not vertical Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q059 | Heterosexual intercourse without condoms Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q060 | Lattice paths coordinate Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q061 | Six friends pizza bill split Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q062 | Pizza two small versus one medium Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q063 | Find all roots x^5 = 64 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q064 | Rock falls Empire State Building Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q065 | Integral involving N(x) cumulative normal Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q066 | Limit sqrt(x^2+x)-x Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q067 | Differentiate x^x with respect to x Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 | ||
| ✓ | rb_ch01_q068 | Two consecutive prime numbers mean prime Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions | x0 |