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31 May, 10:55

Cody was 165/,/text{cm}165cm165, space, c, m tall on the first day of school this year, which was 10/%10%10, percent taller than he was on the first day of school last year.

How tall was Cody on the first day of school last year?

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  1. 31 May, 11:22
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    Assume that Cody was x cm tall on his first day at school last year.

    Assume that Cody is y cm tall on his first day at school this year.

    This year, Cody became 10% taller.

    10% is equivalent to 0.1

    This can be translated into the following:

    y = x + 0.1x

    We are given that y = 165 cm.

    Substitute in the equation to get x as follows:

    165 = x + 0.1x

    165 = 1.1x

    x = 150 cm

    Based on the above calculations, Cody was 150 cm tall on his first day at school last year.
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