The ratio of the number of puffs to the number of cookies in a supermarket is 6 : 1. A puff costs $1.80 and a cookie costs $0.60. If all the puffs and cookies are sold, a sum of $342 will be collected. How many puffs are there altogether?
| |
Puffs |
Cookies |
Total |
| Number |
6 u |
1 u |
|
| Value |
$1.80 |
$0.60 |
|
| Total value |
10.8 u |
0.6 u |
$342 |
Amount collected if all the puffs are sold
= 6 u x 1.8
= 10.8 u
Amount collected if all the cookies are sold
= 1 u x 0.6 u
= 0.6 u
Amount collected if all the puffs and cookies are sold
= 10.8 u + 0.6 u
= 11.4 u
11.4 u = 342
1 u = 342 ÷ 11.4 = 30
Total number of puffs
= 6 u
= 6 x 30
= 180
Answer(s): 180
