Question

Mobile phone weighs 110g to 2 sig. fig.

its put in a protective case that weighs 15.4g to 1 d.p
work out the smallest possible weight, in grams (g), of the phone and the case combined

Answer 1

Below.

Explanation:

Smallest possible weight of the phone = 105 g.

Smallest possible weight of the case = 15.35 g

Answer is 120.35 g.