Posted by **asha** on Monday, September 22, 2008 at 9:19pm.

a local hardware store has a 10-gallon can of gray paint left over that is a mixture of 35% black paint and 65% white paint. how many gallons of white paint will be needed to make the gray mixture 20% black?

note: answers must be 5 gallons, 7.5 gallons, 12 gallons, or 17.5 gallons.

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