Prove that the below maths equation is true.

8 + 8 = 91

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Why is a river so rich ?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

You need to move three matchsticks to form three squares. Can you do it?

When 99 is considered higher than 100?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?