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4 March, 04:31

18 people order soup and sandwiches for lunch. Sandwiches cost 7.75 each and 4.50 the soup. Total cost of 18 luchees was 113.50 how many sandwiches were ordered

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  1. 4 March, 05:47
    0
    Let the soup be x and sandwich be y

    7.75x+4.50y=113.50

    x=18-y

    7.75 (18-y) + 4.50y=113.50

    y=10

    x+y=18

    so x=8
  2. 4 March, 05:56
    0
    Let soups be represented by x and sandwiches by y.

    x + y = 18

    4.5x + 7.75y = 113.50

    x = 18 - y

    4.5 (18 - y) + 7.75 y = 113.5

    = 81 - 4.5y + 7.75y = 113.5

    81 + 3.25y = 113.5

    3.25y = 32.5

    y = 10.

    x + y = 18

    x + 10 = 18

    Thus, x = 8.

    Thus, 8 soups and 10 sandwiches were ordered.
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