The symbols $, # , and @ each represent a different positive

Question: Didn't the question stem indicated that each represents a DIFFERENT positive digit? does this mean that each has a different digit from the other and that digit is positive? or that each have any positive digit? Please clarify... This just sounds odd. The symbols $, # , and @ each represe...

index ratio relationship

In a certain business, production index p is directly proportional to efficiency index e, which is in turn directly proportional to investment index i. What is p if i=70 ?

1) e = 0.5 whenever i = 60.
2) p = 2.0 whenever i = 50.

If [x] denotes....

If [x] denotes the greatest integer less than of equal to x, is [x] = 0 ?

1) 5x + 1 = 3 + 2x

2) 0 < x < 1



*St 1 gives me X so I know its sufficient. But I couldn't figure out the rest.

Thx

Distance and Time/ DS

Is zero half way between S and R ?

1) I agree, not sufficient
2) I don't understand why it is insufficient.
Does S2 say that T-R=T-(-S) ===> T-R = T+S ====> R+S=0
Isn't this sufficient to know if zero is half way between S and R?

Proportion DS

1st part: If they tell me that n is odd, it can be any one of these prime numbers and 2. So why is that incorrect, because it can also be just any of these primes and then it is even? 2nd part: you mean, because we know the range must be less then 6 need to figure which primes under 30 makes n<6 and...