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Chunjuwu,
Dookie is right. let me try explaining..

I will try to sync with Dookie, to avoid any confusion, but will try to be elaborate. Here is the approach.

Let Y be the rose produce in 1980. Let X be the the roses in 1981. We have

(1)Y= 1.4X. Since we have two variables and one equation, we need one more equation relating to Y and X to solve. Hence 1 by itself is insufficient.

(2) X=Y+10. Again this question stem has two variables and one equation. So (2) by itself if insufficient.

combining both (1) and (2) we have two equations and two variables and we can find X and Y for sure. We can solve, but pls dont solve (as per the practice in approaching DS problems).

hey guys, A metallurgist but currently working in a NGO and have scheduled my GMAT in December for second round .....u know. I read some but valuable blogs on this...

Today, 1st year Rotman students had a great simulation event hosted by Scotiabank, one of Canada’s best and largest banks. Attended by entire Rotman 1st year students, the...

Nope. I never learned finance ever in my life until I came to Rotman. This is why I got really frustrated when this term started because I was certain...