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#1 Re: Puzzles and Games » The Problem about a salesman » 2008-01-30 21:39:57
You are absolutely right! He's down $50 total.
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It depends on how you look at it. Cash-wise he's down 30$ from where he started, but he's also down a cap. If you count the cap as a loss, which I would, he's down $50 total, which makes sense. He sold a $20 cap for $20, so he broke even on that exchange, but then the neighbor demanded his $50, so that's a $50 loss.
#2 Puzzles and Games » The Problem about Two Cars » 2008-01-30 21:23:21
- umbros
- Replies: 1
Hi there!
THE PROBLEM:
A man recently bought two cars, but afterwards found that they would not answer the purpose for which he wanted them. So he sold them for $1200 each, making a loss of 20%, on one car and a profit of 20%, on the other.
Did he make a profit on the whole transaction, or a loss? And how much?
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#3 Puzzles and Games » The Problem about a salesman » 2008-01-30 00:36:27
- umbros
- Replies: 2
Hi, everybody!
THE PROBLEM:
A salesman sells caps. One cap costs $20. A buyer agreed to purchase it, but he had only banknote $50. The salesman sent a boy with that banknote $50 to the neighbour to change. The boy came and gave $20+$20+$10. The salesman gave a cap and $30’ change. Not long after the neighbour came and told that $50 was bad money, demanded his money back. The salesman climbed in a cashdesk and returned him $50.
What loss was suffered by a salesman?
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#5 Re: Introductions » Hallo from Russia! » 2008-01-28 20:13:52
Thanks for your welcome!
Russia is the great country, and there were many great scientists, especially mathematicians, in its history.
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#6 Puzzles and Games » The Problem about Bacteria » 2008-01-28 01:58:34
- umbros
- Replies: 5
Hello, everyone!
THE PROBLEM:
There are bacteria in a glass. In one second each of bacteria is gone divided in two, after that each of appeared bacteria in one second gone divided in two etc. In one minute glass is full.
In what time glass was half-filled?
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#7 Introductions » Hallo from Russia! » 2008-01-28 01:37:41
- umbros
- Replies: 9
Hi, everybody 
! Just joined. I always study Math. Also I have some experience of teaching Math as private tutor. I love Math 
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