Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

How many triangles can you find in this given picture?

What's a single-digit number with no value?

In a classic wine shop, the list of three most popular wines are:
- The cost of 1 French wine bottle: 500$
- The cost of 1 German wine bottle: 100$
- The cost of 20 Dutch wine bottles: 100$

John entered the wine shop and he needs to buy
- All three types of wine bottles.
- Needs to buy Dutch wine bottles in multiples of 20.
- Need to buy 100 wine bottles in total.

John has only 10000$. How many wine bottles of each type, John must buy?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

how come the second man dies?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?