Question 16997
Matthew is 3 times as old as jenny.  In 7 years, he will be twice as old as he will be then.  how old is each now.
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3j=m
m+7=2(j+7)
3j+7=2j+14
subtract 2j from both sides.
j+7=14
subtract 7 from both sides.
<b>j=7
m=21<b>