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Difficulty: 800 – 2200

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	#	Name	Tags	Difficulty	Solved by
✓	dn_s27_q030	Manhole cover round 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser geometry classic	1100	x0
✓	dn_s27_q034	Alice and Bob stand at opposite ends 150 Most Frequently Asked Questions on Quant Interviews (Stefanica, Radoicic, Wang) · Ch 2 · Questions	brainteaser ants classic	1600	x0
✓	gb_ch02_q001	Screwy pirates Green Book · Ch 2 · Brain Teasers	brain-teaser game-theory backward-induction classic	1500	x0
✓	gb_ch02_q003	River crossing Green Book · Ch 2 · Brain Teasers	brain-teaser logic optimization classic	1100	x0
✓	gb_ch02_q004	Birthday problem (Cheryl-style) Green Book · Ch 2 · Brain Teasers	brain-teaser logic deduction classic	1400	x0
✓	gb_ch02_q006	Burning ropes Green Book · Ch 2 · Brain Teasers	brain-teaser logic classic	1000	x0
✓	gb_ch02_q007	Defective ball Green Book · Ch 2 · Brain Teasers	brain-teaser logic weighing classic	1700	x0
✓	gb_ch02_q009	Horse race Green Book · Ch 2 · Brain Teasers	brain-teaser logic tournament optimization classic	1500	x0
✓	gb_ch02_q012	Calendar cubes Green Book · Ch 2 · Brain Teasers	brain-teaser thinking-out-of-box classic	1400	x0
✓	gb_ch02_q013	Door to offer Green Book · Ch 2 · Brain Teasers	brain-teaser logic classic	1300	x0
✓	gb_ch02_q015	Last ball Green Book · Ch 2 · Brain Teasers	brain-teaser invariant parity classic	1100	x0
✓	gb_ch02_q016	Light switches Green Book · Ch 2 · Brain Teasers	brain-teaser logic encoding classic	1100	x0
✓	gb_ch02_q018	Coin piles Green Book · Ch 2 · Brain Teasers	brain-teaser symmetry invariant classic	1200	x1
✓	gb_ch02_q019	Mislabeled bags Green Book · Ch 2 · Brain Teasers	brain-teaser logic labels classic	1100	x0
✓	gb_ch02_q020	Wise men Green Book · Ch 2 · Brain Teasers	brain-teaser logic communication classic	1700	x0
✓	gb_ch02_q023	Counterfeit coins I Green Book · Ch 2 · Brain Teasers	brain-teaser weighing encoding classic	1300	x0
✓	gb_ch02_q024	Glass balls Green Book · Ch 2 · Brain Teasers	brain-teaser optimization binary-search-variant classic	1500	x0
✓	gb_ch02_q025	Matching socks Green Book · Ch 2 · Brain Teasers	brain-teaser pigeonhole classic	800	x0
✓	gb_ch02_q026	Handshakes Green Book · Ch 2 · Brain Teasers	brain-teaser pigeonhole graph-theory classic	1100	x0
✓	gb_ch02_q027	Have we met before? Green Book · Ch 2 · Brain Teasers	brain-teaser pigeonhole ramsey-theory classic	1500	x0
✓	gb_ch02_q030	Prisoner problem Green Book · Ch 2 · Brain Teasers	brain-teaser modular-arithmetic parity classic	1600	x0
✓	gb_ch02_q032	Chameleon colors Green Book · Ch 2 · Brain Teasers	brain-teaser modular-arithmetic invariant classic	1600	x0
✓	gb_ch02_q034	Chocolate bar problem Green Book · Ch 2 · Brain Teasers	brain-teaser induction invariant classic	1000	x0
✓	gb_ch02_q035	Race track Green Book · Ch 2 · Brain Teasers	brain-teaser induction graph-theory classic	1500	x0
✓	gb_ch02_q036	Irrational number Green Book · Ch 2 · Brain Teasers	brain-teaser proof-by-contradiction number-theory classic	900	x0
✓	gb_ch02_q037	Rainbow hats Green Book · Ch 2 · Brain Teasers	brain-teaser modular-arithmetic proof-by-contradiction classic	1800	x0
✓	gb_ch03_q007	Snow plow problem Green Book · Ch 3 · Calculus and Linear Algebra	calculus differential-equations applied classic	1700	x0
✓	gb_ch04_q003	Drunk passenger Green Book · Ch 4 · Probability Theory	probability symmetry classic	1500	x0
✓	gb_ch04_q010	Birthday problem Green Book · Ch 4 · Probability Theory	probability birthday-problem classic	1100	x0
✓	gb_ch04_q013	Boys and girls Green Book · Ch 4 · Probability Theory	probability conditional bayes classic	1400	x0
✓	gb_ch04_q016	Fair probability from an unfair coin Green Book · Ch 4 · Probability Theory	probability symmetry construction classic	1300	x0
✓	gb_ch04_q020	Monty Hall problem Green Book · Ch 4 · Probability Theory	probability conditional monty-hall classic	1300	x0
✓	gb_ch07_q016	Poisonous wine Green Book · Ch 7 · Algorithms and Numerical Methods	algorithms binary-encoding puzzle classic	1500	x0
✓	qip_q042	Air Force One (boarding) An Interview Primer for Quantitative Finance (Dirk Bester, 2017) · Ch 2 · Old friends	probability classic induction	1700	x0
✓	rb_ch01_q001	Two glass jugs (water and alcohol) Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle ratios classic	1000	x0
✓	rb_ch01_q004	Old style analogue clock falls off wall Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle partition classic	1100	x0
✓	rb_ch01_q005	Twelve marbles, one different Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle weighing classic	1300	x0
✓	rb_ch01_q020	10000 ants on ruler Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle physics-trick classic	1600	x0
✓	rb_ch01_q025	Three identical light fixtures three switches Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle encoding classic	1600	x0
✓	rb_ch01_q026	Five hats three blue two red Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle logic-deduction classic	1500	x0
✓	rb_ch01_q033	Unfaithful husbands village Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	logic-deduction common-knowledge classic	1700	x0
✓	rb_ch01_q034	Three poles 64 rings Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	recursion tower-of-hanoi classic	1800	x0
✓	rb_ch01_q043	Three children product 36 Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle logic-deduction classic	1600	x0
✓	rb_ch01_q048	Chessboard dominoes corners removed Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle parity coloring classic	1700	x0
✓	rb_ch01_q052	Two string-like fuses 45 seconds Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle fuse-burning classic	1500	x0
✓	rb_ch01_q055	10 regions tax cheat scale Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle weighing encoding classic	1500	x0
✓	rb_ch01_q056	Seven gold bars two cuts Red Book (Heard on the Street) · Ch 1 · Purely Quantitative & Logic Questions	puzzle binary classic	1700	x0

1	inderjeet230502	1218
2	kalash.kankaria	1205