SOLUTION: Egg pencils cost $0.15 each and colored pencils cost $0.21 each if 24 pencils cost $4.02 how many of them were black

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Question 1160512: Egg pencils cost $0.15 each and colored pencils cost $0.21 each if 24 pencils cost $4.02 how many of them were black
Found 3 solutions by greenestamps, saw, Alan3354:
Answer by greenestamps(13203) About Me  (Show Source):
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Egg pencils....???

Answer by saw(34) About Me  (Show Source):
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b = black
c = colored
b+c = 24
0.15b+0.21c = 4.02
Use substitution
b = 24-c
0.15(24-c)+0.21c = 4.02
3.6-0.15c+0.21c = 4.02
3.6+0.06c = 4.02
0.06c = 4.02-3.6
0.06c = 0.42
Divide both sides by 0.06
c = 7
b = 24-7
b = 17
Check----
0.15b+0.21c = 4.02

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
An early version of a chicken pencil.