Question

the sum of 2 rational number is -4/5 if one of the number is -7/20 find the other

Answer 1

Let the other number be 'x'.

So, -7/20 + x = -4/5. We can now transpose -7/20 to the other side-

x= -4/5 + 7/20. Now we can take the LCM of 5 and 20, which is 20.

x= (-4*4 +7)/20 = (-16+7)/20 = -9/20.

Thus, the other number is -9/20 or -0.45.

Answer 2

hello

subtract

-4/5 - (-7/20) we know - * - = +

-4/5 + 7/20

-16+7/20 = -9/20

hence other number is -9/20.

hope it helps you