Question

16

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potatoes
£1.50 per kg
carrots
£1.80 per kg
Jack buys 1 kg of potatoes and kg of carrots.
How much change does he get from £5?

Answer 1

£1.70

Explanation:

given c = change,

c = 5 - 1.50x - 1.80y or c = 5 - (1.50x+1.80y)

with 1 kg each,

c = 5 - 1.50 - 1.80

c = 5 - 3.30

c = 1.70