Question

the product of two rational numbers is -15/20 if one of them Is -10/7‚ find the other


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Answer 1

Step-by-step explanation:

a× (-10/7) = (-15/20)

a= -15×7

-20×10

a= 21/40

Answer 2

Answer:

Given:

Y=-10/7

Let X be unknown number

X*Y=-15/20

Therefore given data can be represented as,

$x \times y = \frac{ - 15}{20}$

since y = -10/7

$x \times \frac{ - 10}{7} = \frac{ - 15}{20}$

Transposing -10/7 to other side

$x = \frac{ - 15}{20} \div \frac{ - 10}{7}$

10/7 becomes -7/10 when transposing to other side

ie

$x = \frac{ - 15}{20} \times \frac{ - 7}{10}$

cancelling 15 and 10 with 5

$x = \frac{ - 3}{20} \times \frac{ - 7}{2}$

on Multiplying (-3)(-7)=+21

and (20)(2)=40

The second number =21/40

$\frac{21}{40}$