Anna spent
311 of her money on 6 cookies and 3 puffs. If each cookie costs twice as much as a puff, how many cookies could Anna buy with the rest of her money?
| |
Cookies |
Puffs |
| Number |
6 |
3 |
| Value |
2 u |
1 u |
| Total value |
12 u |
3 u |
Cost of 1 puff = 1 u
Cost of 1 cookie = 2 u
Total cost of 6 cookies and 3 puffs
= 6 x 2 u + 3 x 1 u
= 15 u
Fraction of Anna's money left
= 1 -
311 =
811311 of Anna's money = 15 u
111 of Anna's money = 15 u ÷ 3 = 5 u
811 of Anna's money = 5 u x 8 = 40 u
Number of cookies that Anna could buy
= 40 u ÷ 2 u
= 20
Answer(s): 20
