Can you count the number of triangles in the given figure?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Imagine you are in a room with no windows or doors. How will you get out?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

How many letters are in the alphabet?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145