Gabby paid $9 for 3 scones and 5 cakes. A cake cost thrice as much as a scone.
- Find the cost of a scone in cents.
- How much more did she pay for a cake than a scone?
| |
Scones |
Cakes |
Total |
| Number |
3 |
5 |
|
| Value |
1 u |
3 u |
|
| Total value |
3 u |
15 u |
18 u |
(a)
Cost of 1 scone = 1 u
Cost of 1 cake = 3 u
Cost of 3 scones
= 3 x 1 u
= 3 u
Cost of 5 cakes
= 5 x 3 u
= 15 u
Total cost of 3 scones and 5 cakes
= 3 u + 15 u
= 18 u
$1 = 100¢
$9 = 9 x 100 = 900¢
18 u = 900
1 u = 900 ÷ 18 = 50
Cost of a bun
= 1 u
= 50¢
(b)
Amount that Gabby paid more for a cake than a scone
= 3 u - 1 u
= 2 u
= 2 x 50
= 100¢
100¢ = $1
Answer(s): (a) 50¢ (b) $1
