Question:
By what numbers should we multiply -15/20 so that the product may be -5/7?
Solution:
Let us assume the other number be y.
Given, product of two rational number = -5/7
One number = -15/20
Then,
= y × (-15/20) = -5/7
= y = (-5/7)/ (-15/20)
= y = (-5/7) × (-20/15)
= y = (-1/7) × (-20/3)
= y = -20/21
So, the other number is -20/21
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