SOLUTION: John is 5 years older than Mary. Mary is half as old as Peter. John is 8 years old. What is Peter's age?

SOLUTION: John is 5 years older than Mary. Mary is half as old as Peter. John is 8 years old. What is Peter's age?

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Question 479061: John is 5 years older than Mary. Mary is half as old as Peter. John is 8 years old. What is Peter's age?
Answer by oberobic(2304) (Show Source): You can put this solution on YOUR website!
J=M+5
M=P/2
J=8
.
So,
J=M+5
J=8
M+5=8
M=3
.
M=P/2
2M=P
2(3)=P
P=6
.
Peter is 6.
.
Done
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