John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

Solve the rebus riddle in the picture below.

Find the next number in the series below

21 32 54 87 131 ?

Using exactly three matchsticks, can you divide the area into two equal parts?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

What have one eye but still cannot see?

You can hear me, but you can't touch or see me.

What am I?

Can you count the number of triangles inside a triangle?