What should be added to 2/5 to get -3/7?

Solution:

The required number can be determined by subtracting the given number from the sum.

Let the required number be x.

x + 2/5 = - 3/7

x = -3/7 - 2/5

x = [-15 - 14] / 35

x = -29/35

Thus, the required number is -29/35 that should be added to 2/5 to get -3/7.

What should be added to 2/5 to get -3/7?

Summary:

-29/35 should be added to 2/5 to get -3/7.