Question

The weight of 70 books is 7 kg. What is the weight of 30 such book

Answer 1

Answer:

3kg

Step-by-step explanation:

weight of 70 books = 7 kg

weight of 1 book = 7/70=0.1 kg

weight of 30 books= 30× 0.1= 3kg

Answer 2

> weight of 30 such book is 3kg.

Question:The weight of 70 books is 7 kg. What is the weight of 30 such book

Solution:

We will apply unitary method here,

weight of 70 books is 7 kg.

= weight of 1 books is 7/70 kg.

= weight of 1 books is 1/10 kg.

Therefore,

weight of 30 such book = 30x 1/10

= 30 x 1 / 10

= 3 kg

Hence, weight of 30 such book is 3kg