Find the next number in the sequence

1, 2, 6, 21, 88, __?

I am white when I am dirty, and black when I am clean. What am I?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

Rihana, Peeta, and Logan order a pizza for $10. Out of the three, Rihana and Peeta were quite hungry and ate 6 slices a piece, while Logan had just 2 slices.

Now, they want to split the cost among them fairly but due to the lack of change, they decide to round off the cost to the nearest possible dollar.

Can you find out the fairway which should be used to split the money?

What if the pizza was worth $11?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I have no life, but I can die. What am I?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

If an electric train is travelling south, then which way is the smoke going?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.