Replace the question mark with the correct number in the below-given picture?

Count the number of triangles in the given picture.

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

What Does this text mean:

important=important

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I know a number which is spelt in alphabetical order.
Do you?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

John is now two fifth of his older brother's age and two years from now he will be half of his older brother's age.
Two years ago, John was only one-fourth the age of his older brother age at that time.

How old is John now?