Billy is $\frac15$ of his brother's age. In $9$ years, Billy will be $\frac12$ of his brother's age. What is the sum of their current ages, in years?

Guest Jul 24, 2021

#1**+1 **

b = 1/5 s s = sibling

b+9 = 1/2 (s+9) sub in the red equation

1/5s + 9 = 1/2s + 4.5

4.5 = .3s

s = 15 y/o b = 1/5 (15) = 3 y/o You can finish......

ElectricPavlov Jul 24, 2021

#2**-1 **

My brain is dead today. I did so much math and english and history. It can't hold anymore info. Please just tell me the answer.

Guest Jul 24, 2021