Question

The weight of 56 books is 8 kg. What is the weight of 152 such books? How many such books weigh 5 kg?

Answer 1

One book weighs approximately 142.86 grams.

Explanation:

If a set of 56 books weighs 8000 grams, you can get average weight of a book, which is `8000/56=142.86` grams.

Now you can compute weights of 152 books `=152*142.86= 21715` grams or approximately 21.7 kg.

If you want to buy 5 kg book, you need to get `5000/142.85=35` books. In other words, 35 books weigh 5 kg (or 5000 grams).