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1 December, 16:42

A teacher has 100 pencils in a cup. 16 are more sharp than dull. How many are dull and how many are sharp?

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  1. 1 December, 17:10
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    X = dull pencils

    y = sharp pencils

    x + y = 100

    y = x + 16 ~~Plug this back into your original x+y equation.

    x+x+16=100 = = > 2x = 84 = = > x = 42. Plug this back into the y = equation

    y = 42 + 16 = = > y = 58.

    42 Dull, 58 sharp.
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