Tammy wanted to buy some scones and biscuits. The cost of a scone was
15 the cost of a biscuit. A set of 4 scones and 3 biscuits cost $11.40. What was the total amount Tammy had to pay for 8 scones and 5 biscuits?
| |
Scones |
Biscuits |
Total |
| Number |
4 |
3 |
|
| Value |
1 u |
5 u |
|
| Total value |
4 u |
15 u |
19 u |
Total cost of scones and biscuits
= 4 u + 15 u
= 19 u
19 u = 11.4
1 u = 11.40 ÷ 19 = 0.6
Cost of 8 scones and 5 biscuits
= 8 x 1 u + 5 x 5 u
= 8 u + 25 u
= 33 u
= 33 x 0.6
= $19.80
Answer(s): $19.80
