Author: Scott Woodbury-Stewart

GMAT OFFICIAL GUIDE PS Solution: We would never be asked to calculate 3^8 or 2^8, so we must approach this problem not as an arithmetic question but as an …

GMAT OFFICIAL GUIDE PS Solution: This is a percent decrease problem. We will use the formula: percent change = (new – old)/old x 100 to calculate the final answer. …

GMAT OFFICIAL GUIDE PS Solution: The fractional ratio indicates that for every 3 Republicans, there are 5 Democrats, a ratio of 3 : 5. We first set up this …

GMAT OFFICIAL GUIDE PS Solution: We use the term “leading zeros” to describe the zeros between the decimal point and the first nonzero decimal digit. To complete this problem …

GMAT OFFICIAL GUIDE PS Solution: This is a two-part probability question. We should first notice that since our answer choices are in decimal form, we can use a real …

GMAT OFFICIAL GUIDE PS Solution: We are given that the ratio of students to teacher is 30 to 1. We can rewrite this using variable multipliers. students : teachers …

GMAT OFFICIAL GUIDE PS Solution: This problem is called a combined work problem. In these problems we use the formula: Work (of machine 1) + Work (of machine 2) …

GMAT OFFICIAL GUIDE PS Solution: This problem will be best solved using the remainder formula. Let’s first state the remainder formula: When positive integer x is divided by positive …