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Q: Twenty-five decreased by one fifth of a number is 18?

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One fifth is a rational fraction. It is not a whole number and cannot be made into one.

One-fifth is 1/5 or 0.2

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-- To add one fifth to a number, add 0.2 to it. -- To find a new number that is one fifth bigger than the original number, multiply the original number by 1.2 .

To find one fifth of a number divide the number into 5. 150 / 5 = 30.

(x3 - 1)/(x - 1) = x2 + x + 1

The number is 50.

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