A two-digit number is such that the product of its digits is 12. If 36 is added to the number, the digits interchange their places. What is the number?

What is the sum of all odd numbers between 100 and 200?

The average of 7 consecutive numbers is 20. What is the largest of these numbers?

A number when divided by 133 gives a remainder of 49. What is the remainder when the same number is divided by 7?