SOLUTION: jimmy's sister is twice as old as he is. his big brother is 5 years older than he is. the sum of their three ages is 29. How old is jimmy's brother?

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Question 1013307: jimmy's sister is twice as old as he is. his big brother is 5 years older than he is. the sum of their three ages is 29. How old is jimmy's brother?
Answer by macston(5194) About Me  (Show Source):
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J=Jimmy's age; S=sister's age=2J; B=brother's age=J+5
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J+S+B=29
J+(2J)+(J+5)=29
4J+5=20
4J=24
J=6
Jimmy is 6 years old
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B=J+5=6+5=11
ANSWER: Jimmy's brother is 11 years old.
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CHECK:
S=2J=2(6)=12
Jimmy's sister is 12 years old.
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J+S+B=29
6+12+11=29
29=29
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