Saturday, March 17, 2012 at 11:40pm.
if a boy is 4 years less than twice his sisters age and the sum of the age is 11 how old is he
go through each of the possibilities of getting to 11. 1+10 2+9 3+8 4+7 and so on. think of what you are looking for, twice the girls age will be four more than the boys age.
or, using algebra
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