In an electric circuit, two resistors with resistances x and y…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We are given the reciprocal of r is equal to the sum of the reciprocals of x and y. Thus we can say: 1/r …
The circle with center C shown above is tangent to both axes…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We begin by creating a right triangle with the x-axis, the radius of circle C to the x-axis and the line segment from center …
If a two-digit positive integer has its digits reversed…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: Let’s first label the original two-digit integer as N. We can then say that N = 10A + B, where A is the tens …
In the coordinate system above, which of the following…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We start by defining the equation of line l using the slope-intercept form of a line (y = mx + b), where m = …
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: …