harshavmrg wrote:
Mike, the solution looks simpler after the explanation is read...so is it that whenever somebody says the a plot is divided equally in n divisions, we can calculate the area and then divide by it...is it always the method to do this type of problems?
Dividing the area is one good strategy to have. Whenever you are dealing with larger numbers, thinking about those numbers in terms of their factors can be a helpful approach. We can't say, though, that this is the approach to use "always." Among other things --- every question about area is going to be different. The GMAC excels at creating new questions that do not resemble anything previously asked. You need to master the math content and have a flexible approach in terms of strategy.
Even if the question is about dividing up a plot, a real curveball can occur if it's possible to lay the rectangles going in two different ways.
Attachment:
garden divided into 16 equal rectangles.JPG [ 25.35 KiB | Viewed 11919 times ]
In this diagram, which divides the 80 x 120 plot into 16 equal rectangles, not all going the same way. I checked for that in the above DS question, and saw that it wasn't possible, but I didn't go into that level of detail in my explanation. Technically, you should be on the lookout for alternate configurations like that, which means you can't simply divide. Nevertheless, questions in which those alternate geometric configurations of rectangles filling a plot are possible do strike me as a bit harder than what the GMAT would ask.
I realize that this is probably a more complicated answer than that for which you were hoping. Does all this make sense? Please let me know if you have any further questions.
Mike
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Mike McGarry
Magoosh Test PrepEducation is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)