Khan Academy on a Stick
Ex 3 Age word problem
William is 4 times as old as Ben. 12 years ago, William was 7 times as old as Ben. How old is Ben now?
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William is 4 times as old as Ben. 12 years ago, William was 7 times as old as Ben. How old is Ben now?
If the above player doesn't work, you can try this direct link.