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7 August, 01:11

At Wren Station High School, there are x physics teachers and y chemistry teachers. The total number of chemistry and physics teachers together is 7. The number of chemistry teachers is 1 fewer than three times the number of physics teachers.

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  1. 7 August, 02:08
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    By 1st condition, x+y=7 - -eqn. 1

    By 2nd condition, 3x-y=1 - -eqn. 2

    By solving the two equations we get 4x = 8

    Therefore x=2

    Substituting in eqn. 1

    2+y=7

    y=7-2

    Therefore y=5

    x=2, y=5
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