Question

Nancy is very happy with the service at the hotel she is staying in. She wants to tip the room service waiter 15 percent of the food bill, which is $120.75. How much should she tip?

Answer 1

$18.11 because 20.75/x=100/15
(120.75/x)*x=(100/15)*x       - we multiply both sides of the equation by x
120.75=6.6666666666667*x       - we divide both sides of the equation by (6.6666666666667) to get x
120.75/6.6666666666667=x 
18.1125=x 
x=18.1125