Joelle spent
79 of her money on 10 biscuits and 5 shortbreads. If each biscuit costs thrice as much as a shortbread, how many shortbreads could Joelle buy with the rest of her money?
| |
Biscuits |
Shortbreads |
| Number |
10 |
5 |
| Value |
3 u |
1 u |
| Total value |
30 u |
5 u |
Cost of 1 shortbread = 1 u
Cost of 1 biscuit = 3 u
Total cost of 10 biscuits and 5 shortbreads
= 10 x 3 u + 5 x 1 u
= 35 u
Fraction of Joelle's money left
= 1 -
79 =
2979 of Joelle's money = 35 u
19 of Joelle's money = 35 u ÷ 7 = 5 u
29 of Joelle's money = 5 u x 2 = 10 u
Number of shortbreads that Joelle could buy
= 10 u ÷ 1 u
= 10
Answer(s): 10
