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30 August, 13:27

Ahmed is taking orders for lunch. A slice of pizza costs $1.50 and a chicken sandwich costs $2.50. He collects $21.50 for the group of 9 people. Assuming each person orders only one item, how many people ordered a chicken sandwich

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  1. 30 August, 16:24
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    Let number of people who ordered pizza are x and number of people who ordered sandwich are y.

    Total number of people = 9, that is x+y=9

    Total collection by the 9 people=$21.50, that is

    1.50x + 2.50y=21.50.

    So we have two equations, which are

    x+y=9, 1.50x + 2.50y = 21.50

    Solving them, we will get

    x=1, y=8

    So number of people ordered chicken sandwich = 8.
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