The mass of 1bag of potatoes is 500g.

Question

3 such bags of potatoes are 475g lighter than a bottle of oil.
(a) What is the mass of 3 bags of potatoes?
(b) What is the mass of the bottle of oil?
Give your answer in kilograms and grams.

Answer 1

(a)

3 ∙ 500 g = 1500 g

Since 1 kg = 1000 g

Mass of 3 bags of potatoes = 1500 g = 1.5 kg

(b)

x = mass of the bottle of oil

3 such bags of potatoes are 475 g lighter than a bottle of oil, means:

3 ∙ 500 g = x - 475 g

1500 g = x - 475 g

Add 475 g to both sides.

1975 g = x

Mass of the bottle of oil = 1975 g = 1.975 kg