Question

If 5 copies of a book weigh 2.1 kg, how
much will 12 copies of the book weigh?​

Answer 1

5 copies book is 2.1kg

12 copies book is ??

$\frac{2.1} 5{ \times 12}$

We get

$5.04$

KGS WEIGHT OF 12 COPIES

Answer 2

$\huge\underline\mathfrak\color{purple}{Answer}$

5 copies of book --> weighs 2.1 kg

12 copies of book --> ?

By cross multiplying,

$= \frac{12 \times 2.1}{5}$

$= \frac{25.2}{5}$

$= 5.04$

Therefore the 12 copies will weigh 5.04 kg