math/fractions
posted by Mary on .
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?

very good