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15 July, 16:01

A tutoring program serves a total of 22 students who are either 15 or 16 years old. The sum of the students' ages is 343. How many 15-year-old students does the tutoring program serve?

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  1. 15 July, 16:19
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    Answer: 9

    Step-by-step explanation:

    If you let x be the amount of 15 year olds and y to be the amount of 16 year olds.

    x+y=22 15x + 16y = 343

    So

    y = 22-x

    15x + 16 (22 - x) = 343

    15x + 352 - 16x = 343

    -x = - 9

    So x = 9

    Therefore 9 15 year olds are on the program
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