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11 July, 21:30

The difference of 9/10 of a number and 30 is the same as 3/5 of the number. Find the number.

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  1. 12 July, 00:11
    0
    The number is 100.

    Step-by-step explanation:

    In order to find the number that is hidden in the given problem, there are a series of equivalencies that have to be made to create an equation to solve the problem.

    9/10 = 0.9

    3/5 = 6/10 = 0.6

    So, this equivalencies established, we are going to perform the following calculation to find the number, by using an equation:

    0.9X - 30 = 0.6X

    0.9X = 0.6 X + 30

    0.9X - 0.6X = 30

    0.3X = 30

    X = 30 / 0.3

    X = 100

    According to this calculation, the number is 100.
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