Gwen paid $18 for 6 cookies and 8 cakes. A cake cost thrice as much as a cookie.
- Find the cost of a cookie in cents.
- How much more did she pay for a cake than a cookie?
| |
Cookies |
Cakes |
Total |
| Number |
6 |
8 |
|
| Value |
1 u |
3 u |
|
| Total value |
6 u |
24 u |
30 u |
(a)
Cost of 1 cookie = 1 u
Cost of 1 cake = 3 u
Cost of 6 cookies
= 6 x 1 u
= 6 u
Cost of 8 cakes
= 8 x 3 u
= 24 u
Total cost of 6 cookies and 8 cakes
= 6 u + 24 u
= 30 u
$1 = 100¢
$18 = 18 x 100 = 1800¢
30 u = 1800
1 u = 1800 ÷ 30 = 60
Cost of a bun
= 1 u
= 60¢
(b)
Amount that Gwen paid more for a cake than a cookie
= 6 u - 1 u
= 5 u
= 5 x 60
= 300¢
300¢ = $3
Answer(s): (a) 60¢ (b) $3
