What has to be broken before you can use it?

Find the next number in the sequence

5 12 24 36 ?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

81 x 9 = 801. What must you do to make the this equation true?

How can you tell a raw egg from a hard-boiled egg?

What has a bottom at the top?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

Why is a river so rich ?