How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

When is the top of a mountain similar to a savings account?

What breaks yet never falls, and what falls yet never breaks?

During which month do people sleep the least?

What always comes into a house through the keyhole?

What am I?

What does this rebus means ?

PROG WORKRESS

Using eight eights and addition only, can you make 1000?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

Find the next number in the series below

21 32 54 87 131 ?