What is the riddle which can be asked all day with a different correct answer each time.

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?

What happened when the wheel was invented?

What work can one never finish?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

what's the probability of getting a king or a queen from a pack of 52 cards?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?