Brain Teasers
Brain Teaser SMS
You are a cook in a remote area with no clocks or other way of keeping time other than a four-minute and a seven-minute hourglass. On the stove is a pot of boiling water. Jill asks you to cook a nine-minute egg in exactly 9 minutes, and you know she is a perfectionist and can tell if you undercook or overcook the egg by even a few seconds. How can you cook the egg for exactly 9 minutes?
Answer: 1. Flip both hourglasses over and drop the egg into the water.
2. When the 4-minute timer runs out, flip it over (4 minutes elapsed, 3 remaining on the 7-minute timer).
3. When the 7-minute timer runs out, flip it over. (7 minutes elapsed, 1 remaining in the 4-minute timer)
4. When the 4-minute timer runs out, flip the 7-minute timer over. (8 minutes elapsed. 6 minutes remained in the 7-minute timer, but flipping it over leaves one minute’s worth of sand on top. When it runs out exactly nine minutes will have elapsed.
Brain Teaser SMS
You must buy 100 chickens for exactly $100, and purchase at least one chicken from each store. The first store charges 5 cents/chicken, the second charges $1/chicken and the third charges $5/chicken. How many chickens should you buy from each store?
Answer:
80 from store 1 = $4
1 from store 2 = $1
19 from store 3 = $95.
Brain Teaser SMS
In British Columbia you cannot take a picture of a man with a wooden leg. Why not?
Answer: You can’t take a picture with a wooden leg. You need a camera (or iPad or cell phone) to take a picture.
Brain Teaser SMS
A cowboy was going to london on his horse. It took 2 days to get there,he stayed for a day and it took him 1 day to get back! He went on friday and came back on friday! How?
