Here is an interesting GMAT number property problem solving question. Concept tested : number of factors.Integer x has n factors; 3x has 3 factors; Which of the following values can n take? I. 1 II. 2 III. 3 A. I only B. II only C. I or II D. II or III E. I or III … [Read more...] about Number Properties Problem Solving : Factors

# GMAT Numbers

## GMAT DS : Number Properties : Even numbers

Is the positive integer x even?1. (x - 1) is a prime number2. (x^2 - 1) is a prime number … [Read more...] about GMAT DS : Number Properties : Even numbers

## Linear Equations : Common Multiples

QuestionA shop sells two variants of chocolates - one that costs $3 and the other that costs $5. If the shop sold $108 chocolates on a given day, how many different combinations of (number of $3 sold, number of $5 sold) exist?A. 6B. 7C. 15D. 8E. 12Correct Answer : Choice D. 8Explanatory AnswerLet the shop sell x numbers of the $3variant and y numbers of the $5 variant.So, 3x + … [Read more...] about Linear Equations : Common Multiples

## Number Properties : LCM, HCF

This question is a relatively easy question on LCM and HCF of two numbers. QuestionIf the product of two positive integers is 144, which of the following could be the LCM and HCF of the two numbers?I. LCM : 24; HCF : 6II. LCM : 18; HCF : 8 III. LCM : 16; HCF : 9A. I onlyB. II and III only C. I and II onlyD. I and III only E. I, II and IIICorrect Answer : Choice … [Read more...] about Number Properties : LCM, HCF

## Counting Methods : GMAT Problem Solving

This GMAT permutation combination practice question is a classic counting methods question focusing on numbers and number properties. You can use the explanation given in this question as a template to solve questions of this kind. After cracking the question, create your own variants of this question and try solving them to master this idea. Question How many odd 4 digit … [Read more...] about Counting Methods : GMAT Problem Solving