Each cow has 4 legs and each chicken has 2 legs. if a boy counts 42 heads and 144 feet, how many cows are there?

Solution:

we are given that

Each cow has 4 legs and each chicken has 2 legs.

A boy counts 42 heads and 144 feet.

we have been asked to find how many cows are there?

Let there are x cows and y chicken.

Then we can write

Hence Number of cows=30