Question

If m - n = 5 and 2m +3n = 15, then m+n=

Answer 1

Answer:

7

Explanation:

(m-n = 5 )×3= 3m - 3n = 15 .........equation 1

2m + 3n= 15...........equation 2

now from 1 and 2 equation

2m + 3n = 15

3m - 3n = 15

+

5m = 30

m = 6...........equation 3

now, from equation 2 and 3

2m + 3n = 15

2×6 +3n = 15

3n = 15 - 12

n = 1

now m + n

6 + 1 = 7