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while riding her bike, jennifer burns 450 calories every 1/2 hour. Based on this rate, how many calories will jennifer burn if she rides her bike for 1 3/4 of an hour?

  • math -

    First, multiply 450 by 2, which is 900 calories for one hour. Now, for the 3/4, set up a proportion.

    .50 / 450 = .75 / ?

    450 X .75 = 337.5

    337.5 / .50 = 675.

    So, Jennifer will burn 675 calories every 3/4 of an hour.

    900 + 675 = 1575, the number of calories Jennifer will burn if she rides her bike for 1 3/4 hours.

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