Diana wanted to buy some shortbreads and puffs. The cost of a shortbread was
14 the cost of a puff. A set of 6 shortbreads and 2 puffs cost $9.80. What was the total amount Diana had to pay for 3 shortbreads and 5 puffs?
| |
Shortbreads |
Puffs |
Total |
| Number |
6 |
2 |
|
| Value |
1 u |
4 u |
|
| Total value |
6 u |
8 u |
14 u |
Total cost of shortbreads and puffs
= 6 u + 8 u
= 14 u
14 u = 9.8
1 u = 9.80 ÷ 14 = 0.7
Cost of 3 shortbreads and 5 puffs
= 3 x 1 u + 5 x 4 u
= 3 u + 20 u
= 23 u
= 23 x 0.7
= $16.10
Answer(s): $16.10
