There are 3 containers. Container x has 3 times the books than container y. Container y has half the books as container z. Container z has 12 few books than container x

Question

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Answer 1

Let x= number of books in container X, then there are x-12 books in container Z. Container Y has (x-12)/2, and x=3(x-12)/2. So 2x=3x-36, 36=3x-2x=x, therefore X contains 36 books; Y contains (36-12)/2=12; and Z contains 36-12=24 books.

CHECK

X contains 3 times contents of Y, 3×12=36. OK.

Y contains half of contents of Z, 24/2=12. OK.

Z contains 12 fewer than X, so Z contains 36-12=24. OK. All OK.