I just began taking the Manhattan CATs and I am finding that the math is significantly more time-consuming than that in the OG. The number of errors is not insubstantial. Spending thirty minutes on a single math problem only to realize that the solution is incorrect can be frustrating, but irrespect...

The suggested solution is B, however there are many instances in which N is even and D is not divisible by 3. For example, each "set" of adding $0.50 creates such a pair. If N = 6, D = 4.50, which is not divisible by 3. N is not odd.