Question

1.3 Dominic buys a calculator costing £7.50, 3 packets of pens costing £1.80 for each packet and

4 rulers. Dominic pays with a £20 note. He gets £4.70 change. Work out the cost of one ruler.​

Answer 1

I believe the answer is .60

Answer 2

One ruler cost 0.60

Explanation:

7.50(1) + 1.80(3) + 4x = 20 - 4.70

7.50 + 5.40 + 4x = 15.30

12.90 + 4x = 15.30

4x = 2.40

x = 0.6