Answer:
we need 420 ounces beacause 35 * 12 = 420
now 1 gallon is = 4*32 = 128 ounces
2 gallons is = 8*32 = 246 ounces
3 gallons is = 12*32 = 384 ounces
4 gallons is = 16*32= 502 ounces
so we need 4 bottles approx
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