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# TOPIC: Project Network Node (math question)

## Project Network Node (math question) 1 year 3 months ago #30423

 Samuel Ouellette Topic Author Offline Fresh Boarder Posts: 1 Thank you received: 0 Hello, I have a math question in regard of the Project network node. in the question the following information is given : ES:21 LS: 37 LF:39 And the question is to calculate EF, Duration and Float. I started the problem with calculating the Duration with the following formula LS-LF +1 (37-39 +1 ) and the answer is 3 days. I got the answer wrong because I was following the Math rule and calculated -1 and I should have been doing 39-37 +1 = 3. But by switching the 37 and 39, I'm not following the math formula anymore... and this is what i don't grasp. Is anyone able to provide some clarity and explain why we are aloud switch number . Thank you, Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Project Network Node (math question) 1 year 3 months ago #30425

 Ehizogie Ero-Brown Offline Fresh Boarder Posts: 1 Thank you received: 0 What helps me is thinking of it practically, day 39, day 38 and day 37. So for duration it is 3 days. Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Project Network Node (math question) 1 year 2 months ago #30438

 alex Visitor The float is 16 and the Duration is 3 LS-ES = Float 37-21 = 16 LF-EF=Float LF-EF=16 39-EF=16 EF=23 EF=ES+D-1 23=21+D-1 D=3 Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Project Network Node (math question) 1 year 2 months ago #30472

 LS Offline Fresh Boarder Posts: 1 Thank you received: 0 LF - LS = EF - ES -> 39 - 37 = EF - 21 => EF = 23 Duration = LF - LS + 1 = EF - ES + 1 = 3 days Float = LF - EF = LS - EF = 39 - 23 = 37 - 21 = 16 days Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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