Question

by what number should we multiply -15/20 so that the product may be -5/7

Answer 1

Let the no. be x

ATQ,
x×(-15/20) =-5/7
x=(-5/7)×(20/-15)
x=20/21

Hope it will help u...

Answer 2

-15/20 * x = -5/7
7 (-15/20 * x ) = -5
-105/20 *7x = -5
-51/10 * 7x = -5
-51 * 70x = -5 * 10
70x = -50+51
70 x = 1
x = 1/70