SOLUTION: chocolate chip cookies sell for 50 cents and oatmeal cookies sell for 35 cents. on monday the bakery sold 20 cookies and made 8.80. how many chocolate chip cookies were sold?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: chocolate chip cookies sell for 50 cents and oatmeal cookies sell for 35 cents. on monday the bakery sold 20 cookies and made 8.80. how many chocolate chip cookies were sold?      Log On


   

Question 335539: chocolate chip cookies sell for 50 cents and oatmeal cookies sell for 35 cents. on monday the bakery sold 20 cookies and made 8.80. how many chocolate chip cookies were sold?
Answer by Fombitz(32388) About Me  (Show Source):
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Let C be the number of chocolate chip cookies, T the number of oatmeal cookies.
1.C%2BT=20
2.50C%2B35T=880
From eq. 1,
C=20-T
Substitute into eq. 2,
50%2820-T%29%2B35T=880
1000-50T%2B35T=880
-15T=-120
highlight%28T=8%29
Then from eq. 1,
C%2B8=20
highlight%28C=12%29