How many triangles can you find in this given picture?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

Can you find out the number that should replace the question mark with a valid reason?

A man dies of old age on his 25 birthday. How is this possible?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Which number comes next in the number series?

2, 9, 30, 93, ?