If 75% of a class answers the first question on a certain test…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: For this overlapping sets problem we can use the following equation: Total percent = % in category A + % in category B – …
The ratio, by volume, of soap to alcohol to water in a…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: The first thing we want to do is set up the ratio of the original solution using variable multipliers. soap : alcohol : water …
0.99999999/1.0001 – 0.99999991/1.0003 =
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: When first looking at this problem, we must consider the fact that 0.99999999/1.0001 and 0.99999991/1.0003 are both pretty nasty-looking fractions. However, this is a …
A rectangular box is 10 inches wide, 10 inches long…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: To solve this problem we must remember that given any rectangular solid, the longest line segment that can be drawn within the solid will …
From the consecutive integers -10 to 10, inclusive…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: This problem is testing our knowledge of the multiplication rules for positive and negative numbers. Remember that when we multiply an even number of …
As x increases from 165 to 166, which of the following must…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: Before jumping into this problem using the numbers provided, we must analyze what is really being tested here. We are really being asked, what …
Of the final grades received by the students in a certain math course…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We start by creating a variable for the total number of students in the math course. We can say: T = Total number of …
The probability is 1/2 that a certain coin will turn up heads…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: In this problem, there are only two events that could occur for the 3 coin flips. Either the coin will land on tails zero …