Welcome to MindCipher, a social repository of the world's greatest brain teasers, logic puzzles and mental challenges.

A Pharmacist's Nightmare

You have 5 jars of pills. Each pill weighs 10 gram, except for contaminated pills contained in one jar, where each pill weighs 9 gm. Given a scale, how could you tell which jar had the contaminated pills in just one measurement?

see explanation

1. Mark the jars with numbers 1 – 5. 2. Take 1 pill from jar 1, take 2 pills from jar 2, and so on up to jar 5 3. Put all of them on the scale at once and take the measurement. 4. Now, subtract the measurement from 150 = ( 1*10 + 2*10 + 3*10 + 4*10 + 5*10) 5. The result will give you the jar number which has contaminated pill.

Comments

None yet. Be the first to comment!
Check out other puzzles:
Random  

Like this? You might also like:
Simple 24
Parodoxical Statements from Life
Mutilated Chessboard Problem
Submitted by
Ravi
over 5 years ago
Likes
Difficulty 7.0 ?

Tags
None

Back