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11 July, 05:46

Alima is solving a question, where a given number has to be multiplied by 15. Alima did not read the question carefully, and multiplied the number by 5 (instead of 15). If her answer is 150 less than the correct answer, find the given number.

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  1. 11 July, 08:40
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    x - Alma's given number

    15•x - the number multiplied by 15 (the correct answer)

    5•x - the number multiplied by Alma (Alma's answer)

    her answer is 150 less than the correct answer:

    5•x = 15•x - 150

    15x - 150 = 5x

    15x - 5x = 150

    10x = 150

    x = 15
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