# If you use 8 gallons of water in 1 hour how many gallons you use in 3 hour 30 minutes?

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Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.

Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.

Given: usage = 8 gal/hr <-- This is a ruler with 8 marks.
need = 3 1/2 hr x 8 gal/hr = 28 gal <-- This is 3 1/2 rulers.

They're not asking about measurement. The question has nothing to do with needing a ruler.

DG, the asker clearly needs to learn basic numbers, counting, addition, multiplication and so on. Those things are learned by handling numbers. Rulers are a convenient and effective means of learning those concepts because they are made of numbers. Your answer is accurate except you ignore the need to learn the basics.

You use the same answer for everything that involves numbers. They weren't looking for how to do it, they were looking for the answer itself.

8 gallons in 1 hour, multiplied by 2 for the next hour would be 16 gallons in 2 hours
Multiply 8x3, that's 24 gallons in 3 hours. Then add another 4 because that's half of 8 and we want to know how much in half an hour.

Answer: 28 gallons in 3 and a half hours.