Problems on Numbers - General Questions

The sum of three consecutive integers is 24. What is the largest of them?

A number exceeds its one-fifth by 80. What is the number?

The difference between a two-digit number and the number obtained by interchanging its digits is 27. What is the difference between the two digits?

The sum of three consecutive integers is 87. What is the largest of them?

When 2 times a number is increased by 13, the result is 25. What is the number?