How many gallons of each of a 4% and an 11% acid solutions should be mixed to obtain 35 gallons of a 7% solution?

How many gallons of each of a 4% and an 11% acid solutions should be mixed to obtain 35 gallons of a 7% solution?
1). 20 gallons, 15 gallons
2). 22 gallons, 13 gallons
3). 13 gallons, 22 gallons
4). 15 gallons, 20 gallons

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