Question

Xander and Darius left a 20% tip after having dinner at a restaurant. The amount of the tip was $5. Xander's dinner cost $15. Which of these equations can you use to find x, the cost of Darius's dinner?

Answer 1

20% is 1/5. since the tip was $5 (20%), multiply it by 5 (since its 1/5 of the total) and you should get the total. the total of both Xander’s and Darius’s dinner is $25. since Xander’s dinner cost $15, subtract that from the total and you should get $10. the cost of Darius’s dinner is $10.