I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Count the number of triangles in the below picture?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?