Question 1102254: One car is seven times as old as the other. It will be 4 times as old 5 years from now. Find the present age of the car. Answer by ikleyn(52790) (Show Source):
"One car is seven times as old as the other." =====> A = 7B (1)
"It will be 4 times as old 5 years from now." =====> A+5 = 4*(B+5) (2)
Substitute (1) into eq(2). You will get
7B +5 = 4*(B+5) ====> 7B + 5 = 4B + 20 ====> 7B - 4B = 20-5 ====> 3B = 15 ====> B = = 5.
Answer. Second car (car B) is 5 years old.
First car (car A) is 7*5 = 35 years old.
