Opal paid $10 for 5 shortbreads and 3 pizzas. A pizza cost five times as much as a shortbread.
- Find the cost of a shortbread in cents.
- How much more did she pay for a pizza than a shortbread?
| |
Shortbreads |
Pizzas |
Total |
| Number |
5 |
3 |
|
| Value |
1 u |
5 u |
|
| Total value |
5 u |
15 u |
20 u |
(a)
Cost of 1 shortbread = 1 u
Cost of 1 pizza = 5 u
Cost of 5 shortbreads
= 5 x 1 u
= 5 u
Cost of 3 pizzas
= 3 x 5 u
= 15 u
Total cost of 5 shortbreads and 3 pizzas
= 5 u + 15 u
= 20 u
$1 = 100¢
$10 = 10 x 100 = 1000¢
20 u = 1000
1 u = 1000 ÷ 20 = 50
Cost of a bun
= 1 u
= 50¢
(b)
Amount that Opal paid more for a pizza than a shortbread
= 5 u - 1 u
= 4 u
= 4 x 50
= 200¢
200¢ = $2
Answer(s): (a) 50¢ (b) $2
