Let original number be x
4/5th of number is (4/5)x
by question
x-(4/5)x=15
(5x-4x) /5=15
x=45
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Answers & Comments
Let original number be x
4/5th of number is (4/5)x
by question
x-(4/5)x=15
(5x-4x) /5=15
x=45