Erika bought 2 puffs more than croissants. Each puff cost $0.90 while each croissant cost $1.80. Given that she spent $28.80 less on the puffs than on the croissants, how many puffs did Erika buy?
| |
Croissants |
Puffs |
Difference |
| Number |
1 u |
1 u + 2 |
|
| Value |
1.80 |
0.90 |
|
| Total value |
1.8 u |
0.9 u + 1.8 |
0.9 u - 1.8 |
Amount that Erika paid for the croissants
= 1 u x 1.8
= 1.8 u
Amount that Erika paid for the puffs
= 0.9 x (1 u + 2)
= 0.9 u + 1.8
Amount that Erika paid less on the puffs than the croissants
= 1.8 u - (0.9 u + 1.8)
= 1.8 u - 0.9 u - 1.8
= 0.9 u - 1.8
0.9 u - 1.8 = 28.80
0.9 u = 28.80 + 1.8
0.9 u = 30.6
1 u = 30.6 ÷ 0.9 = 34
Number of puffs that Erika bought
= 1 u + 2
= 34 + 2
= 36
Answer(s): 36
