If a sprinkler waters 1 over 15 of a lawn in 1 over 5 of an hour, how much time will it take to water the entire lawn?
2 hours
3 hours
10 hours
15 hours

- anonymous

- jamiebookeater

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- Hero

@_greatmath7 giving answers is against CoC

- anonymous

I never saw the answer, yay :)

- anonymous

@Hero
can you walk me through it?

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## More answers

- Hero

Well, do you know how to figure out how much 1/5 of an hour is in minutes?

- anonymous

not really

- Hero

Well let's do it this way:
1/5 of an hour = 1/5 times 60 minutes = 60/5 minutes.

- anonymous

ok

- anonymous

60/5 would be 13 right?

- anonymous

no no 12?

- Hero

Yes, correct, now think of it this way: Every 12 minutes, 1/15 of the lawn is watered so...
The first 12 minutes, 1/15 is watered
After 24 minutes, 2/15 is watered ...
After 36 minutes 3/15 is watered ...
So as you can see, once we get to 15/15, the whole lawn will be watered which will be a total of 15 intervals until the whole lawn is watered. The shortcut to calculate this is to simply take 12 and multiply it by 15. So 12×15 minutes. Then divide that amount by 60 to convert back to hours.

- Hero

Sorry, had to correct a typo.

- anonymous

ok

- anonymous

so then it would be 15 right?

- Hero

What kinds of calculations have you made so far? If you did what I explained, there's no way you get 15. Show me what you did to get 15.

- anonymous

well i didnt get 15 i got 30. i thought that would be 3 hours but 15 made more sense.
this is what is did..

- Hero

Make sure you read the instructions I wrote exactly first.

- Hero

15 is just the number of intervals it takes to water the entire lawn.

- anonymous

12 x 15 = 180
180/60 = 3

- Hero

Yes, that's better.

- anonymous

oh i said 30 before >_<

- anonymous

i meant 3. Would that be 3 hours then?

- Hero

Yes, it would.

- anonymous

ok thank you i will do what i did for this on other questions. i have so many like this

- Hero

Good luck with it.

- anonymous

Thank you for the help. :)

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