Question

By which number -7 /25 should be divided to get -1/15?

Answer 1

`4 (1)/(5)`

Explanation:

`( - 7)/(25) / x = ( - 1)/(15)`

`x = ( - 7)/(25) / ( - 1)/(15)`

`= (7)/(25) * (15)/(1)`

`= (21)/(5) = 4 (1)/(5)`

Answer 2

21/5

Explanation:

if a/b = c, then b=a/c

in other words:

divide -7/25 by -1/15 to get the answer

It also helps to use the fact that a/b / c/d = a/b * d/c

-7/25 / -1/15 = -7/25 * -15/1

= 105 / 25

= 21 / 5