Question

Weight of $15$ books is $6$ kg. What is the weight of $45$ such books?

Answer 1

Step : Find the weight of $45$ books
Given : Weight of 15 books = 6 kg
$\Rightarrow$ Weight of $1$ book = $\frac{6}{15}$kg
$\Rightarrow$Weight of $45$ books = $\frac{6}{15}\times 45$
= $18$ kg
Hence, the weight of $45$ books is $18$ kg.