Question

The weight of 72 books is 9 kg find the weight of 80 such books how many books will weigh 6 kg

Answer 1

Answer:

Weight of 80 books = 10 kg

No. of books weighing 6 kg = 48 books

Step-by-step explanation:

If weight of 72 books = 9 kg

Then weight of 1 book will be $\frac{9}{72}$ kg = $\frac{1}{8} kg$

Then weight of 80 books = $\frac{1}{8}$kg × 80 = 10 kg

No. of books weighing 6 kg = 6 kg ÷ $\frac{1}{8}$kg = 6kg × 8kg = 48 kg

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Answer 2

First we will find the relation between the books and the weight

72 books = 9kg
1 book = 9/72
1 book=0.125kg (equation no 1)
And
9kg=72books
1kg =72/9
1kg =8 (equation no 2)

Now to find the weight of 80 books multiply equation no 1 by 80
1(80)books=0.125(80)kg
80books=10kg

And same goes for the number of books in 6kg i.e multiply equation no 2 by 6
1(6)kg=8(6)books
6kg =48 books