Another approach - two machines together produce 5/4 w widgets in 3 days or 5w in 12 days or 1w in 2.4 days. So, x and y's one day's work = 1/2.4 If you look at the qu. and plug-in the values - lets say, it takes x 6 days to produce w, so it will take y 4 days. X takes 2 days longer to produce w wid...

number line - gmatprep

Pls explain the qu. below. Thanks.

OA - C

avg-median - Gmatprep

Last month 15 homes were sold in Town X. The average sale price of homes was 150,000 and the median was 130,000. Which of the following statements must be true? I. At least one of the homes was sold for more than 165,000 II. At least one of the homes was sold for more than 130,000 and less than 150,...

Sequence - gmatprep

For a finite sequence of non-zero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign for the sequence 1,-3,2,5,-4,-6 A. One B. Two C....

Here goes...

solutions of the equation 4x^2 + 5x + 1 = 0 are -1/4 and -1

AM = (-1/4+-1)/2 = -5/8
GM = (-1/4*-1)^1/2 = 1/2
HM (in case of two nos.) = 2a*b/(a+b)
HM = (2*-1/4*-1)/(-1/4+-1) = -2/5

Absolutely...the other way to look at any slip-ups is that they would happen only to the experimental questions, so won't be marked!!

But you give great explanations...i was just trying to be a pain;)

Line K passes through point (n,-1). Is slope of K positive? 1). K passes through the origin point. slope = 0- (-1)/ 0-n = -1/n can be +ve or -ve based upon n ................ n=-1 so slope =-1/n =1/2 yes +ve SUFF C Thanks a lot...!! A minor slip-up though... slope=1 +ve... [-1/-1] if this was a PS ...