The ratio of the number of cookies to the number of wafers in a supermarket is 6 : 1. A cookie costs $1.40 and a wafer costs $0.40. If all the cookies and wafers are sold, a sum of $88 will be collected. How many cookies are there altogether?
|
Cookies |
Wafers |
Total |
Number |
6 u |
1 u |
|
Value |
$1.40 |
$0.40 |
|
Total value |
8.4 u |
0.4 u |
$88 |
Amount collected if all the cookies are sold
= 6 u x 1.4
= 8.4 u
Amount collected if all the wafers are sold
= 1 u x 0.4 u
= 0.4 u
Amount collected if all the cookies and wafers are sold
= 8.4 u + 0.4 u
= 8.8 u
8.8 u = 88
1 u = 88 ÷ 8.8 = 10
Total number of cookies
= 6 u
= 6 x 10
= 60
Answer(s): 60