If x = 2t and y = t/3, what is the value of x^2 – y^2
May 19, 2016
GMAT OFFICIAL GUIDE DS Solution: Since x = 2t and y = t/3, by substitution, we have x^2 – y^2 (2t)^2 – (t/3)^2 4t^2 – t^2/9 (36t^2)/9 – t^2/9 …
Tag: Official Guide for GMAT Review 2017
A store reported total sales of $385 million for February of…
May 17, 2016
GMAT OFFICIAL GUIDE PS Solution: The formula for percent increase is (New – Old)/Old x 100%. Here the “New” sales is $385 million and the “Old” sales is $320 million. …
The total cost for Company X to produce a batch of tools is $10,000 plus…
May 17, 2016
GMAT OFFICIAL GUIDE PS Solution: We know the relationship between profit, revenue and cost is: profit = revenue – cost or P = R – C (the relationship is actually …
Working simultaneously at their respective constant rates, Machines…
May 17, 2016
GMAT OFFICIAL GUIDE PS Solution: We have a combined worker problem. In such problems we use the equation: Work (1 machine) + Work (2 machine) = Total Work. We …
In the coordinate plane, a circle has center (2, – 3) and passes
May 17, 2016
GMAT OFFICIAL GUIDE PS Solution: The area of a circle is A = πr^2. If we can find the radius, then we can find the area of the circle. Recall …
In the figure above, PQR and STU are identical equilateral triangles…
May 16, 2016
GMAT OFFICIAL GUIDE DS Solution: We are given a diagram with triangles PQR and STU. We are also given that PQR and STU are identical equilateral triangles, and PQ …
In the xy-plane, the straight-line graphs of the three equations above…
May 16, 2016
GMAT OFFICIAL GUIDE DS Solution: We can begin by substituting p and r in for x and y, respectively, in the 3 given equations. 1) r = ap – …
A certain list consists of 3 different numbers. Does the median…
May 16, 2016
GMAT OFFICIAL GUIDE DS Solution: We are given that a certain list contains three different numbers. Let’s label these three numbers. a = smallest number b = middle number …