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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?

 Jul 24, 2021
 #1
avatar+34376 
+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......

 Jul 24, 2021
 #2
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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. 

 Jul 24, 2021
 #3
avatar+34376 
0

Just add them together , Dead-Head.....

ElectricPavlov  Jul 24, 2021
 #6
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Dead Head ... I was wondering if he is Grateful, but ...

Guest Jul 24, 2021
 #4
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Add what? 15 and 1/5?

 Jul 24, 2021
 #7
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+1

...In this case, it’s just a brain-dead head.the unusual fair

Guest Jul 24, 2021
 #9
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3+7 = 10 and that's wrong

 Jul 24, 2021
 #10
avatar+34376 
0

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

 Jul 24, 2021
 #11
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0

Fie wtvr. I gave up. I'm an idiot. So what? angry

 Jul 25, 2021

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