Let C be defined as the sum of all prime numbers between

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pm; Location: Vancouver, BC; Thanked: 5254 times; Followed by:1268 members; GMAT Score:770

by Brent@GMATPrepNow » Fri Dec 07, 2018 6:10 am

AAPL wrote:Princeton Review

Let C be defined as the sum of all prime numbers between 0 and 30. What is C/3?

A. 155
B. 129
C. 61
D. 47
E. 43

C = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29
= 129

So, C/3 = 129/3 = 43

Answer: E

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Brent

Brent Hanneson - Creator of GMATPrepNow.com

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8086; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

by Scott@TargetTestPrep » Thu Mar 21, 2019 4:44 pm

AAPL wrote:Princeton Review

Let C be defined as the sum of all prime numbers between 0 and 30. What is C/3?

A. 155
B. 129
C. 61
D. 47
E. 43

OA E

The sum of the prime numbers from 0 to 10 is:

2 + 3 + 5 + 7 = 17

The sum of the prime numbers from 11 to 20 is:

11 + 13 + 17 + 19 = 60

The sum of the prime numbers from 21 to 30 is:

23 + 29 = 52

So C/3 = (17 + 60 + 52)/3 = 129/3 = 43.

Answer: E

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