jeff1949 said:
Sorry I did say i was a beginner. What did you mean by "give it your best efforts"
I can understand the parts about 4x90 angles in a rectangle and two opposite sets of angles but how do measure the area of a rectangle which is 7m squared. I know you don't give out full tutorials but i just don't understand the question?
Your kind of missing the point. I was not writing a list for you to memorize. I was suggesting that as you approach such a problem, you dump on the page all that you know. Just get it out there. If you don't know some of the stuff I dumped for my example, this is not the point. Get what you know out on the paper or at least let it pas through your mind.
In this case, if the relationship between length and width is not in your head, maybe you should just move on to the next problem.
If it is, then you're in luck. Without much algbra, what could the sides be?
Length * Width = Area
Width is 3 longer than length
1 * 4 = 4 < 7
2 * 5 = 10 > 7
Width must be between 4 and 5. If there are choices less than 4 or greater than 5, throw them out. They can't be right. If you still don't have the right answer, keep thinking.
Well, 4 is three less than 7 and 10 is three greater than 7. Wow! That's the same distance. It looke like 4.5 might be a good guess. If you have 4.2 or 4.7, it might be time to throw those out.
Just for the record, and it is likely that you will NOT have time for this on every problem, the exact anwer is this:
If W is the Width, then W-3 is the Length, and W*(W-3) = 7, the Area, and we have W = 4.541. I did this ONLY to suggest that the techniques and thinking shown previously are of some value. You may not be tested on the solution of quadratic equations. I'm not sure. The only way we would have failed with the approximation concepts I presented is if 4.5 and 4.6 were both on the choice list. I believe they would not do that on this exam. They are asking for an approximation.
You need to learn speed and accuracy. The art of estimation is your greatest asset. As much as it bugs me, formality is not the way to win these exams. GCSE, GMAT, LSAT - all of them. One must MOVE!!!!