Question

One number is 9 more than another number, and their sum is 25. Find the number

Answer 1

8 and 17

Explanation:

a = b + 9 Eq. 1

a + b = 25 Eq. 2

Replacing Eq. 1 on Eq. 2

(b+9) + b = 25

2b + 9 = 25

2b = 25 - 9

2b = 16

b = 16/2

b = 8

from the Eq. 1

a = b + 9

a = 8 + 9

a = 17

Check:

from the Eq 2

a + b = 25

17 + 8 = 25

Answer 2

8

Explanation:

let one of the number be x

other number = x +9

if their sume is 25

X + X + 9 = 25

2X +9 = 25

2X = 25 - 9

2X = 16

X = 16/2

X= 8