Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Which is the smallest number that you can write using all the vowels exactly once?

There are 4 big houses. They are made from the materials: red marble, green marble, white marble and blue marble.

* Mrs Jennifer's house is somewhere to the left of the green marble one and the third one alone is white marble.
* Mrs Sharon owns a red marbles house and Mr Cruz does not live at either end, but lives somewhere to the right of the blue marbles house.
* Mr Danny lives in the fourth house, while the first house is not made from red marble.

Who lives where, and what is their house made from?

Which digit occurred maximum times between the number 1 and 1000?

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?