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10 April, 19:16

In a certain chemical, the ratio of zinc to copper is 4 of 13. a jar of the chemical contains 338 grams of copper. how many grams of zinc does it contain?

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  1. 10 April, 19:19
    0
    If the ratio of zinc to copper is 4 TO 13, then do this.

    4/13 = x/338

    13x = 338 * 4

    13x = 1352

    x = 104

    It contains 104 grams of zinc.
  2. 10 April, 19:26
    0
    4:13 is the ratio for zinc to copper. That means for every 4 grams of zinc you have to have 13 grams of copper.

    They tell you that you have 338 grams of copper.

    4 X

    - - - - - -

    13 338

    Cross multiple would be 4 (338) = 13x

    Simplify

    1352 = 13x

    104=x

    104 grams of zinc
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