Question

the sum of two rational number is 4 by 21 if one of them is 5 by7 find the other​

Answer 1

Answer:

sum of two rational number is 4/21

one number is 5/7

other= 4/21-5/7

=4-15/21

= -11/21

Answer 2

as per your question,

if, the sum of two rational number is 4 by 21

and one of them is 5 by7

so, let other number be y

then ,

5 by 7 + y = 4 by 21

so ,

y= 4 by 21 - 5 by 7

and we get ,

-11 by 21

hence, other number is -11 by 21

check,

(5 by 7 )+ ( -11 by 21)= 4 by 21

and on simplifying we get same

so , verified