What is the word or phrase?

When we see 2 but call 10?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Find the next number in the series below

21 32 54 87 131 ?

Where do fish keep their money?

Which Travels Faster? Solve below famous picture riddle:

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

What is the fastest way to double your money?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?