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20 September, 14:10

A certain alloy contains 5.25% copper. How much copper is there I a piece weighing 200 pounds?

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Answers (2)
  1. 20 September, 14:13
    0
    Find 5.25% of 200

    remember

    1% of 100=1

    therefor

    1% of 200=2

    just remove the decimal and double it (for this special case of finding percent of 200)

    5.25% of 200=5.25 times 2=10.5

    answer is 10.5 pounds of copper

    (the legit way is 0.0525 times 200=10.5 pound)

    10.5lb is answer
  2. 20 September, 14:27
    0
    10.5 lb

    You can look at the question as 5.25% of 200 pounds. The "of" means to multiply so you would multiply 5.25% by 200. 5.25% can be written as 0.0525 (dividing by 100, since percent is of 100).

    0.0525*200=10.5 lb
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