Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

How many times can you subtract the number two from the number fifty?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you find the key in the picture below?

What does this mathematical rebus means ?

Can you solve the maths in the below-given picture equation?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?