Question 62705: Chocolate chip cookies sell for $.50 each and oatmeal cookies sell for $.35 each. On Monday morning, the bakery sold 20 cookies and received $8.80. How many chocolate chip cookies were sold.
Please help. I have been working on this for hours and don't know what I'm doing wrong!
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Chocolate chip cookies sell for $.50 each and oatmeal cookies sell for $.35 each. On Monday morning, the bakery sold 20 cookies and received $8.80. How many chocolate chip cookies were sold.
:
Let x = no. ch chip cookies; Let y = no. of ch oatmeal cookies
:
Write the amt equation:
x + y = 20
Can also write it:
y = 20 - x
:
Write the money equation:
.50x + .35y = 8.80
:
Using the 1st equation where y = (20-x), substitute (20-x) in the 2nd equation:
.50x + .35(20-x) = 8.80
.50x + 7 - .35x = 8.80
.50x - .35x = 8.80 - 7
.15x = 1.80
x = 1.80/.15
x = 12 ch chip cookies
:
I'll let you figure out how many oatmeal cookies, check your solutions in the money equation
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