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First you fibd the weight of 1 bk...then find of 80 bks...ok
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HOPE THIS ANSWER HELPED YOU.
Step-by-step explanation:
Weight of 1 book = 9/72 = 125g
weight of 80 books = 125 * 80 = 10000g or 10kg
80: 10 :: x : 6
x = 8*6
= 48 books
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