How many bananas can you eat if your stomach is empty?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

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)?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?