Replace the question mark with the correct number below.

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What is black when you buy it, red when you use it, and gray when you throw it away?

You can hear me, but you can't touch or see me.

What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

who is silent in the parliament?

You can see three almost identical images below. Can you spot the odd one out from them?

John's five friends Rachel, Jacob, Phoebe, Joey and Chandler live on the same road.

Rachel lives in the house: A, Jacob lives in the house: B, Phoebe lives in the house: C, Joey lives in the house:D, Chandler lives in the house: E

Mathematically
B*C*D = 1260
B + C + D = 2E
2A = E

The road numbers run from 2 to 222.

Can you tell me the house number of each of John's friends?