Free Practice Question
PS · Problem Solving
705-805
Number Properties
The ages of three friends are prime numbers. The sum of the ages is less than 51. If the ages are in Arithmetic Progression (AP) and if at least one of the ages is greater than 10, what is the difference between the maximum possible median and minimum possible median of the ages of the three friends?
Answer Choices
Correct answer marked belowA
5
6
Correct
C
8
D
10
E
12
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Explanation
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What it tests
Your command of divisibility, primes, factors, parity, and how the GMAT tests properties of integers.
Common trap
Forgetting that 1 is not prime, that 0 is divisible by every integer, or that negative numbers flip your assumptions.
Details
Difficulty
705-805
Type
PS
Category