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?

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

If 3/4 of a number is 48, what is 5/6 of that number?

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