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23 March, 13:01

A hobby shop sells 4 times as many model of airplanes than model helicopters the total number of model is 35

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  1. 23 March, 14:24
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    let's call airplanes "a" and helicopters "h".

    The total number of models is 35. This means that a+h=35

    4 times as many model airplanes as model helicopters. This means a=4h.

    we can substitute this into the previous equation:

    4h+h=35

    5h=35

    dividing by 5:

    h=7

    so he has 7 helicopters and 4*7=28 airplanes
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