For this problem you dont need math at all, you just need to know the properties of sets Stem: There is a five number set where the largest number is greater than the median by 3. They ask, basically whether the mean of the set is greater than the median. Remember for odd number sets that in any set...

I want to take as much algebra out of this as possible. Stmt (1) sqrt 36x is an integer. The prime factors of 36 are 3 * 2 * 3 *2 (since 6*6=36). This means that both prime factors have a pair that make it a perfect square. Therefore, in order for 36x to be a perfect square, x must also be a perfect...

... Not getting it. What does the equation look like before you get to 4x=4 or 6y=12 using the differentiation rule. I'm still stuck at the following: 2(x^2-2x)+3(y^2-4y)+18 To use the differentiation rule, you need to know differential calculus which is not a part of GMAT. You can proceed as I men...

I disagree that the answer is C or E. IMO this is how to break down the question. You have a set of 13 different integers. And 30 is the median, which is defined as the middle number in the set, which means that it must be the 7th number in the set. It also says that the range of the set is 30, whic...

When I did this question I did it a little differently. The question is: Is abs. x = a - b, so are both x and -x = a - b (1) x = a - b. From this we know that positive x = a - b, but -x = b - a. Therefore since one is and one isn't that means the absolute value of x cannot = a - b. Which is sufficie...

i thought A and B work together in a couple of days then A quit and B continue working on the left job? According to the question, A and B start working on the project together and A quits 10 days before the project is completed. Now mathematically the event is same as B worked alone for 10 days an...

Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solutions Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new liquid solution is liquid X? a 30% b 33 1/3% c 37 1/2% d 40% e 50% Using...

(1) xy > 0 implies that either both x and y should be positive or both should be negative. So, this is NOT SUFFICIENT to determine whether (-x,y) is in the same quadrant. (2) ax > 0 implies that either a and x should be positive or both should be negative. But there is no info on y. So, (2) is NOT ...