Question

The ratio of the volumes of three buckets is 3 : 4:5. Buckets contain the
mixture of water and alcohol. If the mixture contains water and alcohol in
the ratio 1:4, 1:3 and 2:5 respectively then find the ratio of water and
alcohol when the mixture in all containers are poured in fourth container.
(A) 35:57
(B) 53 : 157
(C) 157:53
(D) 35: 157
(E) None of these
*This is a class 7 question from Olympiad bookI OM​

Answer 1

Answer is 53:157.

Explanation in the attachment.