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#1 2005-12-07 07:03:41

gravity
Member
Registered: 2005-12-07
Posts: 4

problem my son brought home from school

If it takes 16 men, 5 hours to load a ship. How  long will it take 24 men?
Show your workings out?

roll

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#2 2005-12-07 07:15:14

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: problem my son brought home from school

Work out how many man-hours it took.

If 16 men took 5 hours, then it took 16x5 = 80 man-hours.

So, if 24 men were there, then it would take 80÷24 = 3 hours, 20 minutes.


Why did the vector cross the road?
It wanted to be normal.

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#3 2005-12-07 07:35:11

gravity
Member
Registered: 2005-12-07
Posts: 4

Re: problem my son brought home from school

Many thanks, we have been at this for hours. I made this 3 hours 45 mins.
Can see how it is done now!

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#4 2006-10-31 04:35:58

gravity
Member
Registered: 2005-12-07
Posts: 4

Re: problem my son brought home from school

My 8 year old daughter has been told to measure the perimeter of 4 household objects. Surely you can only measure the area of 3D objects? You only measure perimeters when using 2D shapes?

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#5 2006-10-31 04:51:48

polylog
Member
Registered: 2006-09-28
Posts: 162

Re: problem my son brought home from school

Yeah, it doesn't make much sense to talk about the perimiter of 3D objects. However, an object like a ruler or a thin notebook with a tiny width can be thought of as 2D and one can measure their perimeter.

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