Posted by emma on Monday, November 21, 2011 at 6:58pm.
bisi now -- x
ada now -- 29-x
7 yrs ago:
bisi -- x-7
ada -- 29-x - 7 = 22-x
x-7 = 2(22-x)
x-7 = 44 - 2x
3x = 51
x = 17
bisi is now 17
ada is now 12
check:
7 years ago: bisi was 10, ada was 5
Was bisi twice as old as ada ?? YES
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