Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

You can hear me, but you can't touch or see me.

What am I?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

What occurs twice in a week, once in a year but never in a day?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

What do you see in the given picture?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?