Question

2.5 kg of potatoes cost £1.40
Work out the cost of 4.25 kg of potatoes.
5.95

Answer 1

£2.38

Explanation:

Write and solve an equation of ratios:

£1.40 2.5 kg

----------- = ------------

c 4.25 kg

Cross multiplying, we get:

(£1.40)(4.25 kg) = (2.5 kg*c), or

(£1.40)(4.25 kg)

c = -------------------------- = £2.38

2.5 kg