How many times can you subtract the number 5 from 25?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

What is the word or phrase below?
R | E | A | D

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?