The ratio of the number of cars of A dealership to that of B

Question

The ratio of the number of cars of A dealership to that of B dealership was 10:9 in 1994, did dealership B have more cars in 1995 than in 1994?

1)Dealership A had more cars in 1994 than in 1995

2)The ratio of the number of cars of A to that of B is 9:10 iin 1995

BG · Answer

A) is insuff gives no info about dealership B
B) is also insuff gives only a ratio but no number of cars
both combined in suff 
1994-A/B=1000/900
1995-A/B=900/1000
B has less in 1994 than in 1995
1994-A/B=1000/900
1995-A/B=9/10
B has more in 1994 than in 1995
So seems like E)

allabout · Answer

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razrulz · Answer

didnt strain a lot, jus picked E . coz the datas were insuffi

ywilfred · Answer

1) Insufficient. We do not know if the ratio changed.

2) Insufficient. We do not know if the actual number changed. The ratio is only a reflection of A dealership against B dealership.

Using 1) and 2), We know that B has to increase the number of cars since the number of cars from A has gone up but the ratio is not in B's favor.

Ans C

SimaQ · Answer

But from 1 and 2 you can not determine the number of cars.... You can only say that B had more cars than A in 1995, but to say that B had more cars in 1995 than in 1994 (i.e. the number) is impossible....

I try to do such problems by pluging in the numbers. 
Lets say in 1994 A and B had 38 cars in total. Then A had 20 B had 18 cars.
1) statement says that A had less cars in 1995
2) statement gives us the new ratio A=9/19 B=10/19

Now suppose in 1995 both A and B had only 19 cars.... this gives us A=9 B=10.... in that case the answer is NO, B didn't have more cars in 1995.

But if in 1995 A and B had the same number 38 cars: A=18 B=20, then the answer is YES, B had more cars in 1995....

So E is the answer....

The ratio of the number of cars of A dealership to that of B

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