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August 3, 2015

Homework Help: math/fractions

Posted by Mary on Wednesday, June 11, 2008 at 12:32pm.

Ok one more question.

I had this problem:

Kristi jogged for 3/5 of an hour, swam for 1/2 of an hour, and rode her bicycle for 3/4 of an hour. How long did she exercise?

I took it to mean you had to add all the fractions together.

So I found the lcd of all three numbers which would be 20 then I muliplied the fractions by the recpective numbers to get 20 so then I had this:

12/20+10/20+15/20=37/20= 1 17/20

did I work this right?

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