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I had to read these sentences in an article.

Most people need from 7 1/2 to 8 1/2 hours of sleep a night. You cannot save hours of sleep the way you save money in the bank. If you have only 5 hours of sleep for three nights, you don't need to sleep an extra 9 hours on the weekend.

I don't understand how to get 'an extra 9 hours'. Please explain it to me. I'm confused with the clause 'if you have only 5 hours of sleep for three nights'.

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    I'm voting to close this question as off-topic because it is a math puzzle, and not about learning English – user3169 Sep 24 '16 at 16:56
  • 8 hours-5 hours is 3 hours. 3 days x3 hours is 9 hours. Maths: close it. – JavaLatte Sep 24 '16 at 17:31
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    @user3169 my OP is not a math puzzle. Not being a native, I don't understand the phrase '5 hours of sleep for three nights'. Instead of it, I want to use the phrase '5 hours of sleep each night for three nights'. – thein lwin Sep 25 '16 at 0:54
  • I think this question is about learning English, but that might not have been clear to the close voters based on the original form of the question. @theinlwin Is there anything else you can add to make your question a little bit clearer so we can get it reopened? What exactly is it that confuses you about this if-phrase? – snailcar Sep 25 '16 at 1:03
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    @theinlwin I'm puzzled here. If you know that 5 hours of sleep for three nights has the same meaning as 5 hours of sleep each night for three nights, you do understand it. – P. E. Dant Sep 25 '16 at 1:45
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See. 7 1/2 and 8.5 average to 8 hours.

So, if you sleep for 5 hours one day, you've lost 3 hours, right? (8 - 5 = 3)

If you do this for 3 days

, 3 * hours lost each day = total hours lost 3 * 3 = 9
You get 9 hours. So, in order to compensate, you'll have to sleep extra 9 hours

But this is not how it works.
This question doesn't actually belong here.

  • Thanks, Adam Karlson. In the 'if- clause', I'm confused with the phrase '5 hours of sleep for three nights'. Instead of the phrase, can I rewrite '5 hours of sleep each night for three nights'? – thein lwin Sep 24 '16 at 15:18
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    "5 hours of sleep for 3 nights" would be understood as 5 hours sleep each night by most people. "5 hours of sleep over 3 nights" would be understood as 5 hours sleep in total. – Mick Sep 24 '16 at 15:42

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