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15 June, 22:32

A baby gains 11 pounds in its first year of life. The baby gained 4 1/4 pounds during the first four months and 3 1/2pounds in its second four months. How much did the baby gain in the last four months?

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  1. 15 June, 22:36
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    The baby gains 3.25lbs in the last 4 months.

    This problem can be solved by simple subtraction. Take the total amount and subtract the 4 month increments in order to find the find 4 months.

    Total = 1st 4 months + 2nd 4 months + 3rd 4 months

    11 = 4.25 + 3.5 + 3rd 4 months

    11 = 7.75 + 3rd 4 months

    3.25 = 3rd 4 months
  2. 15 June, 22:40
    0
    Amount of weight gain in first year = 11 pounds

    A year can be divided into three parts consisting of four months each.

    According to the question;

    The baby gained 4 1/4 pounds during the first four months and 3 1/2pounds in its second four months.

    Let weight gained in third 4 month be 'x' pounds.

    So;

    => Weight gained in first year = Weight gained in first 4 months + Weight gained in second 4 months + Weight gained in third 4 months

    => 11 pounds = 4.25 pounds + 3.5 pounds + x pounds.

    => x pounds = 11 pounds - 7.75 pounds

    => x pounds = 3.25 pounds

    Therefore, the baby gain 3.25 pounds in the last four months.
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