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29 January, 11:17

The cost of eight stress balls and five T-shirts is $111.75. The cost of twelve stress balls and four T-shirts is $102.00. What is the cost of one T-shirt? (A) $9.75 (B) $12.50 (C) $17.75 (D) $18.25 (E) $18.75

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  1. 29 January, 14:17
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    Let's say stress ball cost x and t shirt cost y

    8x+5y=111.75

    12x+4y=102.00→3x+y=25.5→y=25.5-3x

    8x+5 (25.5-3x) = 111.75

    8x+127.5-15x=111.75

    -7x=-15.75

    x=2.25

    12x+4y=102

    12 (2.25) + 4y=102

    27+4y=102

    4y=75

    y=18.75

    d is the correct answer
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