SOLUTION: black pencils sell at two for 15 cents, and red pencils sell at 10 cents each. How many of each kind were sold if a total of 25 were sold for $2.00?

Question 370252: black pencils sell at two for 15 cents, and red pencils sell at 10 cents each. How many of each kind were sold if a total of 25 were sold for $2.00?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
black pencils sell at two for 15 cents, and red pencils sell at 10 cents each. How many of each kind were sold if a total of 25 were sold for $2.00?
..
black pencils two for 15 cents,
so 1 for 7.5 cents
red pencils 10 cents each.
total of 25 were sold
for $2.00 = 200 cents
...
let black pencils be x numbers
red pencils will be 25-x
..
cost of black pencils = 7.5x
cost of red penci;s = 10(25-x)
..
7.5x+10(25-x)=200
7.5x+250-10x= 200
-2.5x=-250+200
-2.5x=-50
/-2.5
x= -50/-2.5
x=20 pencils ---- black
5 will be red
...
m.ananth@hotmail.ca
..

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