Tammy bought 7 scones more than wafers. Each scone cost $0.70 while each wafer cost $1.80. Given that she spent $29.90 in total, how many wafers did Tammy buy?
| |
Wafers |
Scones |
Total |
| Number |
1 u |
1 u + 7 |
|
| Value |
$1.80 |
$0.70 |
|
| Total value |
1.8 u |
0.7 u + 4.9 |
0.7 u + 4.9 |
Amount that Tammy paid for the wafers
= 1 u x 1.80
= 1.8 u
Amount that Tammy paid for scones
= 0.7 x (1 u + 7)
= 0.7 u + 4.9
Total amount that Tammy paid
= 1.8 u + 0.7 u + 4.9
= 2.5 u + 4.9
2.5 u + 4.9 = 29.9
2.5 u = 29.9 - 4.9
2.5 u = 25
1 u = 25 ÷ 2.5 = 10
Number of wafers that Tammy bought
= 1 u
= 10
Answer(s): 10
