Question

How much longer is a 2 1/2 inch-long piece of string than a 2/5 long piece of string?

Answer 1

It is 21/10 or 2.1 inches longer

Explanation:

2 1/2 - 2/5

= 5/2-2/5

25/10-4/10= 21/10

It is 21/10 or 2.1 inches longer