There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Can you find a number that lies one third of the distance between 1/3 and 2/3?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?