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29 January, 22:24

A tennis instructor chargers $40 for each one hour lesson and $25 for each half hour lesson if the instructors I come from 35 lessons was $1115 how many one hour lessons did she give?

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  1. 29 January, 22:37
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    X = 1 hr lessons and y = 1/2 hr lessons

    x + y = 35 ... y = 35 - x

    40x + 25y = 1115

    40x + 25 (35 - x) = 1115

    40x + 875 - 25x = 1115

    40x - 25x = 1115 - 875

    15x = 240

    x = 240/15

    x = 16 < = = = there are 16 one-hr lessons

    and 19 half-hr lessons
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