If x ≠ 0 and x ≠ 1, and if x is replaced by 1/x…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: Let’s start by substituting 1/x for x. This gives us: Even though our answer does not match any of the answer choices, it is …
For the past n days, the average (arithmetic mean) daily production…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We start with the formula for calculating the average. average = sum/quantity We are given that the initial quantity is n days and that …
Car A is 20 miles behind car B, which is traveling in the same…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We can classify this problem as a “catch up and pass” rate question. This means that one car is catching up to the other …
John and Mary were each paid x dollars in advance to do a…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We are first given that John worked for 10 hours and that Mary worked for 2 hours less than John. So we can say: …
If n = 4p, where p is a prime number greater than 2…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: This is an interesting question because we are immediately given the option to insert any prime number we wish for p. Since this is …
A store currently charges the same price for each towel…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We can start by creating some variables. Q = quantity of towels sold P = price per towel sold Next we can set up …
In the rectangular coordinate system above, the line y = x…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: This problem does contain a diagram that looks like the following: We are given that the line y = x is a perpendicular bisector …
If 75% of a class answers the first question on a certain test…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: For this overlapping sets problem we can use the following equation: Total percent = % in category A + % in category B – …