How many gallons of a 15% acid solution must be mixed with 5 gal of a 35% acid solution to make a 19% acid solution?

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let the number of gallons be x

0.15x+0.35*5 = 19%(x+5)

0.15x+1.75 =0.19x+0.95

0.19x-0.15x = 1.75-0.95

0.04x= 0.8

x= 0.8/0.04

x= 20 gallons

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