Author: Scott Woodbury-Stewart

GMAT OFFICIAL GUIDE PS Solution: Let’s review two rules for the standard deviation: 1. Adding a constant to each value in a data set does not change the value …

The symbol ∆ denotes one of the four arithmetic operations… Solution: Let’s analyze the given inequality: If ∆ = addition: 6 + 3 ≤ 3 9 ≤ 3 Since …

GMAT OFFICIAL GUIDE PS Solution: We can let the number of P units sold = n and the number of Q units sold = 2n, and thus: /(n + …

GMAT OFFICIAL GUIDE PS Solution: Among all the pairs of integers that satisfy m^2 + p^2 < 100, the product mp is greatest if m and p are as …

GMAT OFFICIAL GUIDE PS – Solution: We can let the number = n and create the following equation: 108 + (2/3)n = n Multiplying the entire equation by 3, …

GMAT OFFICIAL GUIDE PS Solution: Let’s simplify the given expression: (k + 2)(k^3 – k) = (k + 2) = (k + 2)(k)(k + 1)(k – 1) Reordering the …

GMAT OFFICIAL GUIDE PS Solution: We can let c = the capacity of the tank. Since when n liters of fuel was added to a tank that was already …

GMAT OFFICIAL GUIDE DS Solution: We are given that x is a positive integer and must determine whether x is prime. Statement One Alone: 3x + 1 is prime. …