Question

the sum of two numbers is 137 and their difference is 43 .find the numbees

Answer 1

Let the number be X and Y.

x + y = 137

and X - y = 43

adding ----

2x = 180

x = 90

Y = 137 - 90 = 47

Answer 2

Let the numbers be a and b
a+b=137
a=137-b (equation 1st)
a-b=43
137-b-b=43
137-2b=43
2b=94
b=47 therefore a=137-47=90