SOLUTION: Chemical A, which costs $5.30 per milliliter, is to be combined with 40mL of Chemical B, which costs $8.30 per milliliter. How much of Chemical A should be used, in order for the

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Chemical A, which costs $5.30 per milliliter, is to be combined with 40mL of Chemical B, which costs $8.30 per milliliter. How much of Chemical A should be used, in order for the       Log On


   



Question 324851: Chemical A, which costs $5.30 per milliliter, is to be combined with 40mL of Chemical B, which costs $8.30 per milliliter. How much of Chemical A should be used, in order for the overall cost to be $6.90 per milliliter?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the amount of A used,
5.3X%2B8.3%2840%29=6.9%28X%2B40%29
5.3X%2B332=6.9X%2B276
-1.6X=-56
highlight%28X=35%29
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Use 35mL of Chemical A.