Question

the weight of 56 books is 8 kg what is the weight of 152 search book how many such books weight 5 kg

Answer 1

Unitary method56 books= 8kg1 book will weigh= 8/56 kgsSo 152 such books will weigh= 8/56 x 152                                               =21.714 kgs
Now, we have been asked how many such books will weigh upto 5 kg....If 8 kg weight is of 56 booksThen 1 kg will be the weight of 56/8 booksAnd 5 kg will be the weight of 56/8 x 5 booksi.e., 7x5= 35 booksHence 35 books will weigh upto 5 kg.

hope it may u to claer ur doubt.

Answer 2

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).