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3 February, 04:00

If the average price of four pairs of shoes is $50, and three of those pairs of shoes are priced at $35, $40 and $55, what is the price of the fourth pair of shoes?

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  1. 3 February, 07:15
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    The average price is calculated by dividing the sum of all prices with the number of items.

    average price = price1+price2 + ... priceN/N

    In our case, we have four pairs of shoes. So, N=4.

    We also know the average price. average price=$50

    We also know the price of the first pair of shoes (price1), of the second (price2) and the third (price3). We need to find out Price4:

    $50=$35+$40+$55+Price4/4

    50*4 = $35+$40+$55+Price4

    $200=$130+Price4

    Price4=200-130

    Price4=$70
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