What number is midway between 2/5 and 1?

4/5

5/6

7/10

The answer is 7/10.

A number which is a midway between two numbers is actually average of those two numbers.

Let x be our desirable midway number:

x = (2/5 + 1) / 2 = (2/5 + 5/5) / 2 = (7/5) / 2 = 7/5 * 1/2 = 7/10