Question

The
weight of 72 books is 9kg, what is the
of 40 such book.
​

Answer 1

Step-by-step explanation:

books - 72. 40

weight - 9kg. x

9 / 72 = x / 40

72x = 9 × 40

x = 9× 40 / 72

x = 5kg

answer

Answer 2

Answer:

$\red\bigstar$ The weight of 40 such books = 5kg.

SOLUTION

The weight of 72 books = 9kg.

$\sf The \: weight \: of \: one \; book = \dfrac{9}{72}$

⇒ The weight of one such book = 125g.

⇒ The weight of one such book = 0.125 kg.

$\boxed{\sf Weight \; of \: 40\: such\: books = Weight \:of \:one\:such\: book * 40 }$

⇒ The weight of 40 such books = 40 × 0.125

⇒ The weight of 40 such books = 5kg.

QUESTION FOR PRACTICE

Q.The weight of 200 coins is 2.5 kg , What is the weight of 140 such coins ?

Answer (For Verification)

Weight of 145 such coins = 1.75 kg.