First, we need to see what 1/5 of a minute is. 60÷5=12 So, there's 3/4 of a gallon every 12 seconds. We need to multiply 3/4 by 5 to find every minute. 3/4×5=15/4=3 3/4 .But, you can tell that he multiplied 3/4 by 1/5, which is not right since you're suppose to do it by 5. But the answer is 3 1/2 gallon per minute.
