Question

The weight of 35 books is 10 kg. raj is asked to carry 42 such books his friends help him by carrying half of the books. how much weight is eah one in carrying?

Answer 1

Answer:

1` Kg

Step-by-step explanation:

The weight of 75 books=15kg

Let the weight of 5 books be x

By cross multiplication

75=15kg

5 =x kg

75x=15 x 5

x=1kg

The weight of 5 books =1 kg

So,each one holds 1 kg

Answer 2

Answer:

Each one will carry 6 kg books.

Step-by-step explanation:

Given,weight of 35 books is 10 kg.

Raj is asked to carry 42 such books his friends help him by carrying half of the books.

By unitary method we can find the answer.

But now question what is unitary method.

By one example we can easily understand aplication of unitary.

Let cost of two balls is 50 rupees.

By unitary method cost pf 1 ball is (50÷2)= 25 rupees.

and cost of 5 balls is (25x5)=125 rupees.

Here given weight of 35 books is 10 kg

So,weight of 1 book is $\frac{10}{35}$kg.

Weight of half of 42 =21 books is $\frac{10}{35} \times 21 = 6$kg.

So,Each one will carry 6 kg.