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Total number of students = # Boys + # Girls = 18+2x

Total number of students = Total Biology + Total Non-Biology = 26+x

26+x = 18+2x

x = 8

or Total students = 34!

Is there anyuthing wrong?
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

Total number of students = # Boys + # Girls = 18+2x

Total number of students = Total Biology + Total Non-Biology = 26+x

26+x = 18+2x

x = 8

or Total students = 34!

Is there anyuthing wrong?

Wow Girish, at least I don't see anything wrong

Once in a while I do get them right

I have been bitten by some of those tricky DS lately and I have improved a little bit.

So I have forced myself to read the #2 first, think carefully and then go to #1. This doesn't work in all cases. But try this on your next DS test and you will surely catch those tricky ones. Just my 0.02cents.
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

Total number of students = # Boys + # Girls = 18+2x

Total number of students = Total Biology + Total Non-Biology = 26+x

26+x = 18+2x

x = 8

or Total students = 34!

Is there anyuthing wrong?

Wow Girish, at least I don't see anything wrong

Once in a while I do get them right

I have been bitten by some of those tricky DS lately and I have improved a little bit.

So I have forced myself to read the #2 first, think carefully and then go to #1. This doesn't work in all cases. But try this on your next DS test and you will surely catch those tricky ones. Just my 0.02cents.

DS is especially tricky. We need to be extra careful. Thanks for the advice. It is a useful approach.

I am not sure if this is right. This approach assume that # of boys NOT studying Biology is 0. Shall we assume that???? if not then C remains the right answer!

vivek123 wrote:

giddi77 wrote:

I think it is B. Total number of students = # Boys + # Girls = 18+2x Total number of students = Total Biology + Total Non-Biology = 26+x 26+x = 18+2x x = 8 or Total students = 34! Is there anyuthing wrong?

Wow Girish, at least I don't see anything wrong

giddi77 is perfectly ok.

# of boys NOT studying Biology could be anything; it doesnot matter. The question is simply about the number of total students and B alone sufficiently provides that number.
So B is enough.