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15 April, 12:35

3. The diameter of the large bird bath is 6 feet. The CGJ girls plan to put bird perches around the outside edge of the bath such that there is at least 3 feet between the perches. At most, how many perches will they be able to install?

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  1. 15 April, 15:59
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    First we need to determine the circumference of the bath.

    Circumference = Diameter X pi

    6 (pi) = 18.84 feet

    and the girls want to put perches that are at least 3 feet between each other so you can just divide the circumference by 3

    18.84 / 3 = 6.28 so 6

    If you don't understand the concept then think of it like this, if you have in total 18.84 feet and you want to place something down every 3 feet then start subtracting 3 from your total till you can't add anymore perches.

    18 - 3 = 15

    15 - 3 = 12

    12 - 3 = 9

    9 - 3 = 6

    6 - 3 = 3

    3 - 3 = 0

    We subtracted 3, SIX times so we added 6 perches
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