the cost of the meal is 21.60 with a tip. how much is the meal without the tip? let x = cost of meal without tip

the tip is 20% of x or 0.2x

together, x + 0.2x =21.60

1.2x = 21.6

x = 18 I obviously am lacking in my percents, and or decimals because I think I know how to add and subtract but still do not realize how 21.60 - 0.2 equals 18. easy question I know I just dont see it