Ten classic questions about testing IQ
There are two unevenly distributed incense, and the burning time of each incense is one hour. How do you determine the time of 45 minutes?
A manager has three daughters, and their ages add up to 13, which is equal to the manager's own age. A subordinate already knows the manager's age, but still can't determine the age of the manager's three daughters. At this time, the manager said that only one daughter's hair was black, and then the subordinates knew the age of the manager's three daughters. What are the ages of the three daughters? Why?
Three people went to a hotel and stayed in three rooms. Each room cost 10, so they paid the boss 30 dollars.
The next day, the boss thought that $25 was only enough for three rooms, so he asked his brother to return $5 to three guests.
Who knows, my younger brother was greedy, and only returned 1 USD to everyone, and secretly took $2, which was equivalent to nine dollars for each of the three guests.
So three people spent 27 * * *, and the younger brother left 2 dollars, so the total was 29 dollars. But at the beginning, the three of them paid 30 dollars, so 1 dollar?
Ten classic questions about testing IQ
There are two blind people. They all bought two pairs of black socks and two pairs of white socks. Eight pairs of socks are made of the same cloth and the same size.
Each pair of socks is affixed with trademark paper. Two blind people accidentally mixed up eight pairs of socks. How can each of them get back two pairs of black socks and two pairs of white socks?
One train leaves Los Angeles for new york at a speed of 15km/h, and the other train leaves new york for Los Angeles at a speed of 20km/h ... If a bird departs from two trains at a speed of 30 km/h, meets another train and returns, and flies back and forth in turn until the two trains meet, how long does it take for the bird to fly?
You have two jars, 50 red marbles and 50 blue marbles. Choose a jar at random and put a marble in the jar at random. How can we give red marbles the best chance to be selected? What is the exact probability of getting the red ball in your plan?
Ten classic questions about testing IQ
You have four jars containing pills, and each pill has a certain weight. The contaminated pill is the uncontaminated weight+1. You only weigh it once. How do you know which jar is polluted?
You have a bucket of jelly, including yellow, green and red. Close your eyes and grab two jellies of the same color. How many can you catch to make sure you have two jellies of the same color?
For a batch of lamps numbered 1 ~ 100, all switches are turned on, and the following operations are performed: switch in the opposite direction every multiple of 1; A multiple of 2 toggles the switch in the opposite direction again; A multiple of 3 turns the switch in the opposite direction again ... Q: Finally, the number of lights in the off state.
Imagine you are in front of a mirror. Excuse me, why can the image in the mirror be upside down, but not upside down?
Ten classic answers to IQ test
One incense is lit at both ends, and the other incense is lit at the same time. It's exactly half an hour, until both ends of the incense burn out. At this time, only one end of incense is lit and two ends are lit, so it can be burned for another 15 minutes, which is exactly 45 minutes.
2, 2, 9, because only 36=6*6* 1 36=9*2*2.
How come it's the first day and it's nine dollars per person? Everyone is (25/3)+ 1 every day, and the difference of one yuan is 25-24= 1.
Ten classic answers to IQ test
Take one for each pair.
(D/35)*30=D
Pick a red one with your eyes open. Red has the greatest chance, except that you are color blind. Hehe, of course, their chances are all 1/2.
Ten classic answers to IQ test
Take a number from a number and weigh it.
four
When the square root of a number is an integer, it is ultra-low and others are ultra-high. So the number 123468 100 is over.
Because when you look in the mirror, the mirror is vertical and parallel to you, but it just turns 180 degrees horizontally.