Question

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

Answer 1

Answer:

5.04kg

Step-by-step explanation:

5/12=2.1/x

5x=25.2

x=5.04kg

Answer 2

Answer:

5.04 kg

Step-by-step explanation:

5 copies = 2.1 kg

By unitary method:

1 copy = 2.1 kg ÷ 5 = 21/5

12 copies = 2.1/5 × 12

= 5.04 kg