Gillian paid $8 for 7 biscuits and 3 pizzas. A pizza cost thrice as much as a biscuit.
- Find the cost of a biscuit in cents.
- How much more did she pay for a pizza than a biscuit?
| |
Biscuits |
Pizzas |
Total |
| Number |
7 |
3 |
|
| Value |
1 u |
3 u |
|
| Total value |
7 u |
9 u |
16 u |
(a)
Cost of 1 biscuit = 1 u
Cost of 1 pizza = 3 u
Cost of 7 biscuits
= 7 x 1 u
= 7 u
Cost of 3 pizzas
= 3 x 3 u
= 9 u
Total cost of 7 biscuits and 3 pizzas
= 7 u + 9 u
= 16 u
$1 = 100¢
$8 = 8 x 100 = 800¢
16 u = 800
1 u = 800 ÷ 16 = 50
Cost of a bun
= 1 u
= 50¢
(b)
Amount that Gillian paid more for a pizza than a biscuit
= 7 u - 1 u
= 6 u
= 6 x 50
= 300¢
300¢ = $3
Answer(s): (a) 50¢ (b) $3
