Math Is Fun Forum

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

You are not logged in.

#101 2009-01-27 06:17:21

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Brain Teasers

Yes all correct!!

Offline

#102 2009-01-27 07:13:18

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Brain Teasers

Last edited by JaneFairfax (2009-01-27 07:40:06)

Offline

#103 2009-01-27 07:37:29

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Brain Teasers

JFF i don't think i have posted a 27 yet. smile
Yet i agree with you! The puzzle was invented by Charles S. Dodgson or better known as Lewis Carroll.

27. A man drove his car 1 mile to the top of a mountain at the rate of 15 miles per hour. How fast must he drive 1 mile down the other side in order to average 30 miles per hour for the whole trip of 2 miles?

28. A bottle and its cork cost together $1.10. The bottle costs a dollar more than the cork. How much does the bottle cost?

29. Each of two apple women had 30 apples for sale. The first sold hers at the rate of 2 for a nickel, the second at the rate of 3 for a nickel. at the end of the day their respective receipts were 75 cents and 50 cents, or $1.25 in all. The next day the women decided to do business together, so they pooled their 60 apples and sold them at a rate of 5 for a dime( 2 for a nickel plus 3 for a nickel). Upon counting their joint receipts at the end of the day they were dismayed to find that they had only $1.20. They searched all about them for that other nickel, and wound up by bitterly accusing each other of having taken it. Where was it?

Offline

#104 2009-01-27 08:28:55

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Brain Teasers

Last edited by JaneFairfax (2009-01-27 08:37:16)

Offline

#105 2009-01-27 11:17:59

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Brain Teasers

excellent.jpg
all correct!

Offline

#106 2009-01-30 06:19:21

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Brain Teasers

How about i restate 25:

Where can a man set out from his house, walk five miles due south, five miles due west, and five miles due north - and find himself back home? The original question: What color was the bear?

30. A large business firm was once planning to open a new branch in a certain city, and advertised positions for three clerks. Out of the number of applicants the personal manager selected three promising young men and addressed them in the following way: " Your salaries are to begin at a rate of $1000 per year, to be paid every half-year. If your work is satisfactory, and we keep you, your salaries will be raised. Which would you prefer, a raise of $150 per year or a raise of $50 every half-year?" The first two of the three applicants eagerly accepted the first alternative, but the third young man, after a moments reflection, took the second. He was promptly put in charge of the other two, Why?

31. A clock strikes six in 5 seconds. How long does it take to strike twelve?

32. A frog is at a bottom of a 30-foot well. Each hour he climbs 3 feet and slips back 2. How many hours does it take him to get out?

Offline

#107 2009-01-30 07:42:34

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Brain Teasers

careless25 wrote:

How about i restate 25:

It would be nice if you restated it in metric!! mad

Offline

#108 2009-01-30 10:34:47

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Brain Teasers

What is it with you and the metric system?
Anyways it doesnt matter, the answer can be derived without the use of any metric system:)

Offline

#109 2009-02-07 02:20:47

balyansk
Member
Registered: 2007-12-22
Posts: 1

Re: Brain Teasers

30.         every half year sal for first and second guy will be 500, 500, 575,575,650,650 and so on
however for the third guy it will be 500, 550,600,650,700,750       u can see the diff

31.     11 secs

32.    28 days

Offline

#110 2009-02-07 07:26:49

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Brain Teasers

careless25 wrote:

What is it with you and the metric system?

And what is it with you that you and your cumbersome non-metric system? Are you honestly trying to tell me that you really like converting yards to miles so much?

Last edited by JaneFairfax (2009-02-07 07:36:00)

Offline

#111 2009-02-07 08:17:35

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Brain Teasers

no i m not saying that i like the non-metric system it is just that you have to live with. I kno it is much easier with a base 10 system. To tell you the truth i like doing math in my head just for the challenge of it, so converting from miles to yards, or any conversion is fun for me. There is no challenge in a base 10 system, its just ingrained in us.

Offline

#112 2009-03-02 05:06:17

emadstats
Member
Registered: 2009-02-13
Posts: 9

Re: Brain Teasers

i dont know

Offline

Board footer

Powered by FluxBB