Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

What breaks yet never falls, and what falls yet never breaks?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Identify the hidden meaning behind this picture?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?