Question

A sum of money worth £13 consists of an equal number of coins worth 50 pence : 20 pence and 10 pence. How many coins of each kind are there?

Answer 1

Let $x$ =the number of coins of each kind. Then

$$50x+20x+10x=1300$$

$$80x=1300$$

$$x=16.25$$

Since $x$ is integer, then the problem has no answer.