Question

A number increased by 100% and decreased by 20% is x. What is the number ?

Answer 1

Number y is increased by 100 percent, which can be denoted by y(2), and then decreased by 20 percent, which will further make it y(2)(.8). So the number is 1.6y. Really, you can use any variable, and if you multiply it by 1.6 you will get x