Question

By what number should (-15)-1 be divided so that the quotient may be equal to (-5)-1?

Answer 1

Let the number be = x

So,

(-15)-1 ÷ x = (-5)-1

1/-15 × 1/x = 1/-5

1/x = (1×-15)/-5

1/x = 3

x = 1/3