Math (PS) The choir consists of 5 boys and 6 girls. In how many ways can the singers be arranged in a row, so that all the boys are together? Do not differentiate between arrangements that are obtained by swapping two boys or two girls. (A) 120 (B)...

Math (PS) There are two bars of gold-silver alloy; one piece has 2 parts of gold to 3 parts of silver, and the other has 3 parts of gold to 7 parts of silver. If both bars are melted into a 8-kg bar with the final...

Math (PS) If one of two parallel lines has 7 points on it and the other has 8, how many triangles can be drawn using the points? (A) 168 (B) 196 (C) 316 (D) 364 (E) 455 GMAT Daily Deals Save $100, plus get a $275 bonus offer from GMAT Club when you...

This post was written by Rich Zwelling. For more GMAT prep tips, check out the Knewton GMAT blog. I run the risk of sounding like a hypocrite here. I’m often fond of telling my students that the GMAT is a reasoning test, not a...

Math (PS) A number of light bulbs were purchased to illuminate a gym. However, only of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or $96, was reimbursed. How much money was spent on illuminating the gym? (A) 360 (B)...

Math (PS) How many distinct integers are factors of 90? (A) 6 (B) 8 (C) 9 (D) 10 (E) 12 GMAT Daily Deals Experience the Manhattan GMAT difference at one of the free trial classes. Attend the first session to get discounts. Learn more! 5 days only: Get 10-20% off of Precision Essay Services...

Last week, I focused on rate problems involving speed (if you’re looking to the answer to last week’s challenge question, scroll down to the end of this post!). This week, I’m going to shift to work-rate problems, which some students find even more challenging. You...

Math (PS) At Daifu university, 40% of all students are both members of a student organization and want to reduce their tuition costs. 20% of those students who want to reduce tuition are not members of the student organization. What percentage of all Daifu students want...

Math (PS) If function satisfies for all , which of the following must be true? (A) (B) (C) (D) (E) GMAT Daily Deals Join Kaplan in their Road to Business School. Seminars, meet and greets, and admission advice. Register now! Get a head start on application...

Math (PS) How many odd three-digit integers greater than 800 are there such that all their digits are different? (A) 40 (B) 56 (C) 72 (D) 81 (E) 104 GMAT Daily Deals Experience the Manhattan GMAT difference at one of our free trial classes. Attend the first session of our full course and...