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#1 2005-07-03 21:05:11

ganesh
Registered: 2005-06-28
Posts: 26,647

Try this one!

I have 4 marked weights with me and they all add up to 40 kg.
With a pair of scales, I can distribute any weighment from 1 to 40 kg(Whole numbers).
What are the four weights????

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2 2005-07-04 04:15:55

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

Re: Try this one!

I think I've seen that one somewhere on this site before, but anyway, I've done this before so I won't say.

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

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#3 2005-07-04 10:34:27

MathsIsFun
Registered: 2005-01-21
Posts: 7,686

Re: Try this one!

Ummm ... 1kg, and ...

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#4 2005-07-06 22:17:28

ganesh
Registered: 2005-06-28
Posts: 26,647

Re: Try this one!

1, 3, 9, and 27 kg

1 kg can be directly weighed
3-1=2, (Which means putting 3kg  on the left pan and 1kg on the right,
2kg of material can be got)
3 can be directly weighed,
3+1=4,
9-(3+1)=5,
9-3=6,
(9+1)-3=7,
9-1=8,
9 can be directly weighed,
9+1=10
and so on.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#5 2005-07-06 22:47:10

MathsIsFun
Registered: 2005-01-21
Posts: 7,686

Re: Try this one!

You solved it too quickly !

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#6 2005-07-06 22:47:54

MathsIsFun
Registered: 2005-01-21
Posts: 7,686

Re: Try this one!

You solved it too quickly !

Some of us are a bit  s....l...o....w

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#7 2012-05-02 12:26:20

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,039

Re: Try this one!

Agreed,MIF. Some of us are so slow,that we reply 7 years later.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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