Question

The sum of two rational numbers is −5/ 12 . If one of the numbers is −8/ 21 , find the other number

Answer 1

Solutions :-

Given :
Sum of two rational numbers = -5/12
One number = -8/21

Let the other number be x


A/q

=> x + -8/21 = -5/12
=> x = -5/12 + 8/21
=> x = (-35 + 32)/84
=> x = -3/84 = -1/28


Hence,
The other rational number = -1/28

Answer 2

let the no.be x
then
$x + ( - 8 \div 21) = - 5 \div 12$
$x = \frac{ - 5}{12} + \frac{8}{21}$
Lcm =84
then
$\frac{ - 5 \times 7 + 8 \times 4}{84} = \frac{ - 3}{84 } = \frac{ - 1}{28}$