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25 January, 01:50

Isandro and Yvette each have a calculator. Yvette starts at 100 and subtracts 7 each time. Isandro on the other hand, starts at zero and adds 3 each time. If they press the keys at the same time, will their displays ever show the same number? if so, what is the number?

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  1. 25 January, 02:01
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    Yvette = 100-7x

    Isandro = 0+3x

    0+3x = 100 - 7x

    0+3x+7x = 100 - 7x + 7x

    10x = 100

    x = 10

    So on the 10th time they have the same number, which is 30.
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