SOLUTION: Gerald who is twelve years old is two times as old as his sister Jane. How old was Gerald when he was three times as old as Jane

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Question 1167890: Gerald who is twelve years old is two times as old as his sister Jane.
How old was Gerald when he was three times as old as Jane
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
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Gerald who is twelve years old is two times as old as his sister Jane.
How old was Gerald when he was three times as old as Jane
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x, Jane
y, Gerald
system%28y=12%2Cx=6%29---------simply what the description gives.


When Gerald was 3 times as old as jane, p years ago.
12-p=3%286-p%29
-
12-p=18-3p
-p=6-3p
3p-p=6
2p=6
highlight_green%28p=3%29------three years ago.

Gerald WAS highlight%28highlight%289%29%29 years old.