Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you solve below mathematical equation?

2^1234 - 2^1233

How do you go from 98 to 720 using just one letter?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

What is the largest number you can write with just 3 digits?

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?

What number divided by 4 is the same as that number minus 4?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?