Last year the price per share of Stock X increased by k percent…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: To start, we need to create a few variables. p = price per share of stock X e = earnings per share of stock …
The positive integer n is divisible by 25. If n^1/2 is…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We can solve this problem by translating the given information into math equations. We are first given that the positive integer n is divisible …
How many prime numbers between 1 and 100…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We start by prime factoring 7,150. 7,150 = 715 x 10 = 143 x 5 x 10 At this point we must be careful. …
For any positive integer n, the sum of the first n positive integers…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: Although a formula is provided in this problem, we can easily solve it using a different formula: sum = (average)(quantity) Let’s first determine the …
A tank contains 10,000 gallons of a solution that is 5 percent…
May 7, 2015
GMAT OFFICIAL GUIDE PS – Solution: We start with 10,000 gallons of a solution that is 5% sodium chloride by volume. This means that there are 0.05 x 10,000 …
If d=1/(2^3*5^7) is expressed as a terminating decimal, how…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: Since actually dividing 1/(2^3*5^7) would be time consuming, we want to manipulate d so that we are working with a cleaner denominator. The easiest …
A positive number x is multiplied by 2, and this product…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: We need to produce an equation from the information given in the problem stem. We are first given that x is multiplied by 2 …
An empty pool being filled with water at a constant rate…
May 7, 2015
GMAT OFFICIAL GUIDE PS Solution: To solve we can setup a proportion. The proportion will read: A time of 8 hours is to filling up 3/5 of the pool …