- 200lb of cucumbers was delivered to the grocery store and left in a storage room. The cucumbers contained 99% of water. After some time part of water evaporated and the contents of water in cucumbers became 98%. What is the weight of cucumbers now?
- You have 2 candles. Every candle lights for 60 minutes. You have to find the way to measure 45 minutes.
- A snail wants to creep on to the top of the tree 5m high. During the day it can creep up 3m but during the night it creeps down 2m. How many days does it need to reach the top?
- 9 coins,one of them is fake. Use a balance to weigh them not more than 3 times and find the fake.A fake coin is not necessarily lighter.
- Connect 9 dots with 4 lines . Don't cross the same dot twice. . . . . . . . . .
- Parachutist is landing the island in the darkness. The island is of unknown shape. There must be a fenced lot at the island. The parachutist needs to find out if he is within the fenced lot or outside.
- A band is going in the street with a constant speed.Someone in the last raw has a dog.The dog runs ahead, reaches the front line of the band and gets back to it's owner. The dog's speed was also constant all the way and while it was running the band passed 50 feet. Find the length of the dog's path,if the distance between the front and the rear line of the band is 50 feet.
- There are 100 gold coins in 10 columns by 10 coins in each column. Every coin weights 1 lb. One column contains 10 fake coins.Each coin in it weights 0.9 lb. Take one measurement to find the column with fakes.
Sent Hari R., National Semiconductor
- Two drivers are going to the next town which is 100 miles away. They depart at the same time, however the first driver stops for gas during the first 50 miles, the second driver stops during the second half. Each stop takes 10 minutes. They both drive with the same speed 60 mph during the first 50 miles and 65 mph during the second half. Who, do you think, arrives first?
- A chess board has 64 squares.Two squares in the diagonal corners are masked out.Is it possible to cover the rest 62 squares with 31 dominos? (One domino covers two squares.) Explain the logic of your answer.
- There are four numbers: 1, 2, 5, 10 that you have to carry in a boat across a river. Every time you may not carry more than two numbers , and the time of traveling is associated with the largest of two numbers. One number has to be in the boat during the return journey, which also defines the time for this trip. What is the minimum total time to carry all numbers from one bank to another?
- A man is running across a bridge.When he is 3/8 of the way accross, he heard a train coming behind him. If he keeps running he will reach the end of the bridge at the same time with the train. If he turns around and runs back, he will get to the beginning of the bridge at the same time with the train. The man runs at a speed of 5mph. What is the speed of the train?
This was sent by John Sonmez from Texas.The interviewer asked him not to use paper but do the calculation in his head.
- We are going to play a paper-rock game (similar to paper-rock-scissors). If we both have "paper" - I pay you $3, if we both have "rock" - I pay you $1. If they don't match - you pay me $2. Suggest a winning strategy?
- There is a large cube that is composed of small sugar cubes. The large cube is 10 sugar cubes long, by 10 sugar cubes wide, by 10 sugar cubes high. How many sugar cubes are on the surface of the large cube?
Received from Zach, college student
- An escalator is descending at constant speed. A walks down and takes 50 steps to reach the bottom. B runs down and takes 90 steps in the same time as A takes 10 steps. how many steps are visible when the escalator is not operating.
- There are 3 switches in one room that control 3 electrical lamps located in the other room.You are allowed to spend 5 minutes in the room with switches,change their position as you want.Then you should go to the room with lamps and tell exactly what switch controls every lamp.You can't return to the room with switches.
- There is a pot full of water. How to pour out half of it without using a meter?
- A point is chosen at random from within a circular region.What is the probability that the point is closer to the center of the region than it is to the boundary of the region.
- Why are manhole covers round ?
Sent by John M., LTX corp.
- If you ask electronics engineer " To be or not to be ?" , his answer will be "One!" How come?
- You are playing a game with your partner.The idea is to cover a round table with quaters. The one who puts the last coin - wins.Suggest a winning strategy.
Sent by Ronni , Oren Semiconductor
- There are 8 metal balls, one of them is lighter. How many times do you need to weight the balls to find the light one? Try to minimize that number.
- How to cut a plain circular cake for 8 people with just three straight cuts of knife?
- A man went down to the river with two jugs, one of three-liter capacity and one of five-liter capacity. Using just these , how did he bring back exactly four liters?
- You drove to the next town with a speed of 60 miles/hour. On your way back the speed was 40 miles/hour. The distance is 120 miles. Calculate the average speed.
- How many gas stations in San-Francisco?
- Here is a quickie someone from LSI Logic asked me a while back
You are sitting in a boat in the middle of a lake. You pick up a rock from the boat and throw it into the lake. Did your action raise or lower the water level at the edge of the lake?
- Why do they make pizza boxes square?
- The bridge had 3 lanes. After reconstruction it will have 4 lanes. What is the persantage of the increase in carrying capacity?
- There are 3 switches in one room that control 3 electrical lamps located in the other room.You are allowed to spend 5 minutes in the room with switches,change their position as you want.Then you should go to the room with lamps and tell exactly what switch controls every lamp.You can't return to the room with switches.
Saturday, September 4, 2010
Quick Thinking Tests
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