Question

Krisha is 9 years older than her youngest brother.the sum of their ages is 25.what are their ages?

Answer 1

K = Krisha’s ages

B = Brother’s ages

Krisha is 9 years older than her youngest brother mean:

K = B + 9

The sum of their ages is 25 mean:

K + B = 25

Replace K with B + 9 in this equation.

B + 9 + B = 25

2 B + 9 = 25

Subtract 9 to both sides

2 B = 16

Divide both sides by 2

B = 8


K = B + 9 = 8 + 9 = 17


Krisha is 17 yrs old

Brother is 8 yrs old