SOLUTION: a book shelf contain x book. When 4/5 of the book are removed, i have 25 book left. how many book were on the shelf

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Question 1205771: a book shelf contain x book. When 4/5 of the book are removed,
i have 25 book left. how many book were on the shelf
Found 2 solutions by ikleyn, Edwin McCravy:
Answer by ikleyn(52900) About Me  (Show Source):
You can put this solution on YOUR website!
.
a book shelf contain x book. When 4/5 of the book are removed,
i have 25 book left. how many book were on the shelf
~~~~~~~~~~~~~~~~~~~ 

From the problem, the remaining 25 books is 1/5 of x.


Hence, x is 5 times 25, or 125.


ANSWER.  x= 125.

Solved.



Answer by Edwin McCravy(20064) About Me  (Show Source):
You can put this solution on YOUR website!
highlight%28cross%28a%29%29 highlight%28A%29 book shelf highlight%28cross%28contain%29%29 highlight%28contains%29 x highlight%28cross%28book%29%29 highlight%28books%29. When 4/5 of the
highlight%28cross%28book%29%29 highlight%28books%29 are removed, highlight%28cross%28i%29%29 highlight%28I%29 have 25 highlight%28cross%28book%29%29 highlight%28books%29 left. highlight%28cross%28how%29%29 highlight%28How%29 many
highlight%28cross%28book%29%29 highlight%28books%29 were on the highlight%28cross%28shelf%29%29 highlight%28%22shelf%3F%22%29

%28matrix%282%2C1%2Cx%2Cbooks%29%29-expr%284%2F5%29%28matrix%282%2C1%2Cx%2Cbooks%29%29%22%22=%22%22%28matrix%282%2C1%2C25%2Cbooks%29%29

x-expr%284%2F5%29x+=+25

Multiply through by 5 to clear the fraction:

5x-4x=125

x=125 books.

Edwin