The total cost of the home theater system, the toaster and the kettle is $600. The kettle costs twice as much as the toaster. The home theater system costs thrice as much as the total price of the kettle and toaster. How much less does the kettle cost than the home theater system?

Kettle	Toaster	Home Theater System
2 u	1 u
3 u		9 u
2 u	1 u	9 u

Cost of the toaster = 1 u
Cost of the kettle = 2 u

Total cost of the toaster and the kettle
= 1 u + 2 u
= 3 u

Cost of the home theater system
= 3 x 3 u
= 9 u

Total cost of the kettle, the toaster and home theater system
= 9 u + 1 u + 2 u
= 12 u

12 u = 600

1 u = 600 ÷ 12 = 50

Amount that the kettle cost less than the home theater system
= 9 u - 2 u
= 7 u
= 7 x 50
= $350

Answer(s): $350