Author: Jeff Miller

GMAT OFFICIAL GUIDE PS Solution: Let’s estimate √3, √5, √6, and √7. √3 ≈ 1.7 √5 ≈ 2.2 √6 ≈ 2.4 √7 ≈ 2.7 Thus: A) 10 x 1.7 …

GMAT OFFICIAL GUIDE PS Solution: We’ll use the simple interest formula for both parts of this question: I = P x r x t , where I = interest, …

GMAT OFFICIAL GUIDE PS Solution: We can set up the following expression: (181,000 – 79,000)/79,000 x 100 Estimating, we have: (180,000 – 80,000)/80,000 x 100 100,000/80,000 x 100 10/8 …

GMAT OFFICIAL GUIDE PS Solution: Let’s let n = the number of units sold in order to break even. The variable cost per unit is 0.4 x 2 = …

GMAT OFFICIAL GUIDE PS Solution: We can let the coordinates of Q be (x, y). Since the origin (0, 0) is the midpoint of PQ, we have: (r + …

GMAT OFFICIAL GUIDE PS Solution: We can create the equation: 40x + 22(48 – 40) = 816 40x + 22(8) = 816 40x + 176 = 816 40x = …

GMAT OFFICIAL GUIDE PS Solution: The original average salary is 3,250/5 = 650. If each of the 5 salaries will increase by 10%, the new sum of the salaries …

GMAT OFFICIAL GUIDE PS Solution: Since the sphere is inscribed in the cube, the length of an edge of the cube = the diameter of the sphere. Recall that …