Question

1. 108 identical books have a mass of 30 kg. Find

(i) the mass of 150 such books
(ii) the number of such books that have a mass of 20 kg

Answer 1

i) around 41.7 kg

ii) 72 books

Explanation:

i) if 108 books are 30 kg then how much is the mass for 150? You cross multiply so 150 multiply by 30 and 108 multiply by x (the unknown mass). you will get 4500=108x and then 4500/108 is the unknown mass.

ii) use the same way as above.