80 books arranged over three shelves. if 7 books are moved from the top shelf to the middle shelf and 8 books taken away from the bottom shelf, there would be an equal number of books on each shelf.
How many of books are on the middle shelf originally?
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IF 8 BOOKS ARE REMOVED FROM THE BOTTEM SHELF THEN 80-8=72
DEVIDE 72 BOOKS IN THREE SHELF 72/3=24
THERE ARE 24 BOOKS IN THE MIDDLE SHELF
NOW REMOVE 7 BOOKS FROM THE MIDDLE SHELF 24-7=17
THERE WHERE 17 BOOKS IN THE MIDDLE SHELF.
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