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26 November, 02:36

The number 21 is decreased to 15. What is the percentage by which the number was decreased, to the nearest tenth of a percent?

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  1. 26 November, 02:59
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    Initial Number = x = 21

    Number after it is decreased = y = 15

    Total decrease form initial to the current number = z = x-y = 21-15 = 6

    % of decrease = (z/x) * 100 = (6/21) * 100 = 600/21 = 28.5714286 = 28.6 (correcting it to 10th place)
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