18 days
Explanation:
3/16 x 6 = 1 2/16 x 3 = 3 6/16
6 x 3 = 18
Since Eve takes 3/16 gallon of milk each day,
1 day = 3/16 gallon
x days = 3 gallons
Cross-multiply
3/16x = 3
3/16x÷3/16 = 3/3/16
Reciprocate
x = 3 × 16/3
x = 16 gallons
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