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23 September, 16:52

Brass is an alloy made from copper and zinc in the ratio 3:2, based on weight. If 120g of copper are needed for a certain piece of brass, how much zinc will be needed for the same piece?

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Answers (2)
  1. 23 September, 19:19
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    The answer is 80.

    You would first, divide 120 by 3.

    Then, multiply 40 by 2.
  2. 23 September, 20:25
    0
    3 + 2 = 5 Five parts of a whole

    3/5 - cooper

    2/5 - zinc

    3/5 = 120g [ * (5/3

    3/5 * 5/3 = 120g * 5/3

    1 (100%) = 600/3g = 200g

    200g * 2/5 = 400/5g = 80g zinc
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