SOLUTION: 4 gallons of a light purple paint that is 15% blue are combined with a dark purple paint that is 60% blue. How many gallons of a dark purple paint must be used to create a purple p

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Question 1079376: 4 gallons of a light purple paint that is 15% blue are combined with a dark purple paint that is 60% blue. How many gallons of a dark purple paint must be used to create a purple paint that is 30% blue?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x, gallons of dark purple paint (60% Blue)

Equating the quantities of "blue" for ingredients and the mixture,

60x%2B15%2A4=30%28x%2B4%29