Book Maths Puzzle Age Problem

At present the sum of the parents� ages is twice the sum of the children�s� ages. Five years ago, the sum of the parents� ages was four times the sum of the children�s� ages. Fif

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Book Other Question

A train, an hour after starting, meets with an accident which detains it one hour, after which it proceeds at 3/5 of its former rate and arrives three hours late. But, had the acc The amount (by weight) of gold, silver and lead in three alloys of these metals are in the ratios:

4:3:2; 3:5:1; and 2:2:5.

It is desired to make a fourth alloy containing e