Find the Missing Number in the Diagram | logical reasoning puzzles with answers

Answer: 9

More Logic Puzzles with answers

More Logic Puzzles

Five hundred begins it, five hundred ends it, Five in the middle is seen; First of all figures, the first of all letters, Take up their stations between. Join all together, and then you will bring Before you the name of an eminent king. Who am I?
Four members of a band are walking to a night concert. They decide to take a shortcut, but must cross a bridge. Luckily they have one flashlight. Because of the varying size of their instruments, it takes each member a different amount of time to cross the bridge - it takes the first person one minute, the second person two minutes, the third person five minutes and the fourth person ten minutes. They must cross the bridge in pairs, travelling at the slower speed so if the one minute person went with the ten minute person, it would take a total of ten minutes. Since there is only one flashlight, one person must come back across the bridge, then another pair can cross. They only have 17 minutes to cross the bridge and still get to the concert on time. What order should they cross to get everyone across and get to the concert?
Fred is listening to the raido when it suddenly stops playing. Nobody is with Fred and nobody touches the radio. A few seconds later, the radio resumes playing. How can this be?
George was cleaning the windows on the eighteenth floor of an office block when there was a massive power failure. The electric hoist on his platform was immoblized. So how did he manage to get down before the power was restored?
I have 10 red socks and 10 blue socks in a drawer. How many socks must I take out to ensure that I have at least one matching pair? One how many to ensure I have at least a pair of red and a pair of blue?
I have three envelopes, into one of them I put a $20 note. I lay the envelopes out on a table in front of me and allow you to pick one envelope. You hold but do not open this envelope. I then take one of the envelopes from the table, demonstrate to you that it was empty, screw it up and throw it away. The question is would you rather stick with the envelope you have selected or exchange it for the one on the table. Why? What would be the expected value to you of the exchange?
If a man is trapped in a room. There are no doors no windows how did he get out?
If place 1 cake of soap on a pan of a scale and 3/4 cake of soap and a 3/4-pound weight on the other, the pans balance. How much does a cake of soap weigh?
If the date of the last Saturday of last month and the first Sunday of this month do not add up to 33, what month are you in?
If you have two quarters on a table touching each other, how can you move one of the quarters without touching it? You are only allowed to touch one quarter but not move it. You cant touch the quarter that you move. You want to get at least enough room between the two quarters to insert another coin between the two quarters.
If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?
In a contest, there are four fruits (an apple, a banana, an orange, and a pear) which have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. There were 123 participants in the contest. The results are; 43 people guessed none correctly, 39 people guessed one correctly and 31 people have guessed two correctly. How many people guessed three correctly and how many people guessed all four correctly?