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12 April, 20:46

Jon finds a box of 350 postcards. He selects a random sample of 75 postcards and finds that 27 already have a stamp on them. Predict the total number of postcards in the box with stamps on them.

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  1. 13 April, 00:40
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    126

    Step-by-step explanation:

    Let the total number of postcard with stamp on it = x

    Out of 350 postcards, x has stamp on it.

    Out of 75 postcards, 27 has stamp on it.

    Expressing these as a ratio:

    350:x=75:27

    350/x=75/27

    Cross multiply

    75x=350*27

    x = (350*27) / 75

    x = 126

    Therefore, the the total number of postcards in the box with stamps on them is 126.
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