Question

The ratio of chickens, lambs and cows is 1:2:4 respectively. If the total number of animals is 21, how many lambs are there?

Answer 1

6

Explanation:

In terms of "ratio units", lambs make up 2/(1+2+4) = 2/7 of the total of animals.

2/7 · 21 = 6

There are 6 lambs.