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?

If 20% of a number is equal to 30% of another number, what is the ratio of the first number to the second number?

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?