Amy and her friend Theo have stopped at the newsagent on their way home from college to buy some snacks.
4 chocolate bars and 3 packets of mints cost £4.70
5 chocolate bars and 1 packet of mints cost £4.50
Work out the cost of a chocolate bar and the cost of a packet of mints.
Answer:
Since 5 chocolate bars and a packet of mints costs £4.50 one packet of mints costs £4.50 minus the price of 5 chocolate bars.
Since 4 chocolate bars and 3 packets of mints costs £4.70 if you substitute in the new price of a packet of mints the cost of 4 chocolate bars plus £13.50 and minus 15 chocolate bars = £4.70
Therefore, £8.80 = the cost of 11 chocolate bars
Therefore, one chocolate bar is £0.80
Substituting this number into the cost of chocolate bars in the first equation means 4 x 0.8 (£3.20) plus 3 packets of mints costs £4.70
This means 3 packets of mints costs £1.50
The cost of one packet of mints is £0.50