SOLUTION: Mary was 4 times as old as Ann 10 years ago.if she is now twice as old as Ann, how old is mary

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Question 257187: Mary was 4 times as old as Ann 10 years ago.if she is now twice as old as Ann, how old is mary
Answer by dabanfield(803) About Me  (Show Source):
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Mary was 4 times as old as Ann 10 years ago.if she is now twice as old as Ann, how old is mary
Let M be Mary's age today. Let A be Ann's age today.
Then we have:
1) M-10 = 4*(A-10) and
2) M = 2*A or A = M/2
Substititute A= M/2 in the first equation and solve for M.