Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 25,306

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.

Offline

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

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.

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,685

Ummm ... 1kg, and ...

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

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 25,306

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.

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,685

You solved it too quickly !

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

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,685

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

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,037

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.

Offline

Pages: **1**