When we see 2 but call 10?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

What work can one never finish?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Different lights make me strange by changing me into different sizes. What am I?

If 21x = 79x, what is the value of x?

2, 3, 5, 9, 17, _ What is the next number in the sequence?