Jean paid $12 for 3 wafers and 7 pizzas. A pizza cost thrice as much as a wafer.
- Find the cost of a wafer in cents.
- How much more did she pay for a pizza than a wafer?
| |
Wafers |
Pizzas |
Total |
| Number |
3 |
7 |
|
| Value |
1 u |
3 u |
|
| Total value |
3 u |
21 u |
24 u |
(a)
Cost of 1 wafer = 1 u
Cost of 1 pizza = 3 u
Cost of 3 wafers
= 3 x 1 u
= 3 u
Cost of 7 pizzas
= 7 x 3 u
= 21 u
Total cost of 3 wafers and 7 pizzas
= 3 u + 21 u
= 24 u
$1 = 100¢
$12 = 12 x 100 = 1200¢
24 u = 1200
1 u = 1200 ÷ 24 = 50
Cost of a bun
= 1 u
= 50¢
(b)
Amount that Jean paid more for a pizza than a wafer
= 3 u - 1 u
= 2 u
= 2 x 50
= 100¢
100¢ = $1
Answer(s): (a) 50¢ (b) $1
