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

Can you solve below mathematical equation?

2^1234 - 2^1233

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?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

Find the value of "?" in the ball picture Riddle below:

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?