Question

7. Product of two rational numbers is _3/4
one of them is 2/7 find the other.​

Answer 1

Answer:

a × b = -3/4

2/7 × b = -3/4

b = -3/4 × 7/2

b = -21/8

Answer 2

Answer:

I think maths answers must not be told directly. so see the sum and try to do it ok.

The sum of two rational numbers = \frac { 9 }{ 20 }

And, one of the numbers = \frac { 2 }{ 5 }

The other rational number

= 9/20 – (2/5)

∴ LCM of 20 and 5 = 20

= (9 × 1)/ (20 × 1) – (2 × 4)/(5 × 4)

(∵ LCM of 20 and 5 = 20)

= 9/20 – 8/20

= (9 – 8)/20 = 1/20