gmat1634777593

Here is another explanation of why the triangle is right angle. The arc is 3/4th of the circumference. hence the interior angle of that arc is 3/4*360 or 270 degrees. (properties of circle). The triangle formed is on the other side of the arc, where the interior angle is 360-270.

Total number of registrations that came in is 25+22+19=66, hence 36 duplicate registrations. Say "x" number of students take all 3 subjects, "a" number take maths and eng, "b" take maths and history and "c" take history and maths. Duplicate entries are for a+b+c+x. so, 25-(a+b+x) + 19-(b+c+x) + 22-(a+c+x) + a+b+c+x = 30 or, 25 -a -b -x + 19 - b -c -x + 22 -a -c -x + a+b+c+x = 30 or, 25 +19 -b -x + 22 -a -c -x = 30 or 66 -(a+b+c+2x) = 30 or a+b+c+2x = 36 => duplicate registrations.... How do we get range of values for x ? We need to know number of students who took 2 subjects

Rectangles are supposed to have 90 degree on all sides, so its diagonals would bisect at 90 degree at the center right ? What is this question looking for ?

Hi, I am starting with GMAT prep. I graduated 10 years back and its been ~12 years since I last touched maths. I took a GMAT test to see where I stand and found my math skills need some refreshing or better grilling. I did get the official guide and the kaplan quantitative guide but they dont appear to be enough to get all fundamentals covered in GMAT refreshed to take on practice questions/tests. Any recommendation on a good material to start with will be greatly appreciated. I am looking for something that discusses a topic and gives a dozen or more questions testing that topic so that the concepts get clear and better imprinted on our memory ... the kaplan guide does disucss some basic fundamentals but practise tests are inter-mingled... Thanks in advance for the help.