A probability problem by Partha Pratim Chanda
Probability
Level
1
A class of 20 students borrowed library books for their research projects. Some of the students, borrowed 3 books each, and the rest borrowed 2 books each. If a total of 52 books were borrowed, how many of the students borrowed 3 books each?
11
10
8
12
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1 solution
let the no of students who borrowed 3 books each be x then no of students who issued 2 books each =20-x by the condition, 3x+2(20-x)=52.
x=12