Three friends rented a car for a week and divided the cost equally. What was the total cost of renting the car?
(1) if the three friends had kept the car for a second week, they could have obtained the two-week rate, which was 1.5 times the cost of a one-week rental.
(2) If a fourth friend had joined the three friends and the cost had been divided equally among the four friends, the cost to each of the original three would have been reduced by $15.
Stmt1: Let say cost of car is 3x and each person paid x.
in this case total cost will be 3x+(1.5)3x = 7.5x and each will pay 2.5 x in this case. But cannot determine cost so insufficient.
Stmt2: Let say cost of car is 12x. In case three would have paid then each has to pay 12x /3 = 4x.
In case four would have paid then each has to pay 12x /4 = 3x
Diff is 15$ => 4x - 3x = 15 => x = 15
and cost of car will be 12x = 12 * 15 = 180$, hence sufficient.
So, answer is b
My debrief: done-and-dusted-730-q49-v40