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

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

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Can you find out the remainder when 3^300 is divided by 5?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Can you find a number that lies one third of the distance between 1/3 and 2/3?