Examples of Math Problems: Emily can paint her fence in 6 hours. If she does the job with her son, it take 2.5 hours less. How long would it take her son working alone.

Wednesday, August 21, 2013

Emily can paint her fence in 6 hours. If she does the job with her son, it take 2.5 hours less. How long would it take her son working alone.

Emily: 1/6
son: 1/7
together: 1/3.5

so we can write:

%0D%0A1%2F6%2B1%2Ft=1%2F3.5%0D%0A

%0D%0A1%2F6%2B1%2Ft=1%2F3.5%0D%0A

%0D%0At=%286%2A3.5%29%2F%286-3.5%29%0D%0A

so her so can do it in 8.4 hours

:)

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