Question

what should be added to -2 upon 7 to get 9 upon 13?

Answer 1

let the required value be x .

according to question,

- 2/ 7 + x = 9 /13

x = 9 /13 + 2/ 7

x = ( 63 + 26 ) / 91

x = 89 / 91

hence, 89/91 should be added to -2/7 to get 9 /13.

your answer : 89 /91