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