Last visit was: 19 Jul 2025, 10:51 It is currently 19 Jul 2025, 10:51
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
EgmatQuantExpert
User avatar
e-GMAT Representative
Joined: 04 Jan 2015
Last visit: 02 Apr 2024
Posts: 3,681
Own Kudos:
19,481
 [13]
Given Kudos: 165
Expert
Expert reply
Posts: 3,681
Kudos: 19,481
 [13]
1
Kudos
Add Kudos
12
Bookmarks
Bookmark this Post
User avatar
EgmatQuantExpert
User avatar
e-GMAT Representative
Joined: 04 Jan 2015
Last visit: 02 Apr 2024
Posts: 3,681
Own Kudos:
19,481
 [1]
Given Kudos: 165
Expert
Expert reply
Posts: 3,681
Kudos: 19,481
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Abhishek009
User avatar
Board of Directors
Joined: 11 Jun 2011
Last visit: 18 Jul 2025
Posts: 5,965
Own Kudos:
5,161
 [1]
Given Kudos: 463
Status:QA & VA Forum Moderator
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
Posts: 5,965
Kudos: 5,161
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
pandeyashwin
Joined: 14 Jun 2018
Last visit: 25 Jan 2019
Posts: 169
Own Kudos:
293
 [2]
Given Kudos: 176
Posts: 169
Kudos: 293
 [2]
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Equation is one way.
Another way is to think about the the impact 100 had on 65's which increased it to 70.
Since the new average is 70 , the excess score for the last match is 100-70 = 30.
We have 30 runs which we can distribute to the previous matches to bring it up to 70.
Since each score needs to be increased by 5 , we get 30/5 = 6
User avatar
QuantMadeEasy
Joined: 28 Feb 2014
Last visit: 16 Jul 2025
Posts: 502
Own Kudos:
Given Kudos: 78
Location: India
Concentration: General Management, International Business
GPA: 3.97
WE:Engineering (Education)
Posts: 502
Kudos: 745
Kudos
Add Kudos
Bookmarks
Bookmark this Post
EgmatQuantExpert
Solve any Mean and Standard deviation question under a minute- Exercise Question #3

3-If for the past ‘n’ matches, the average runs scored by Steve is 65 runs. If today’s century increased his overall average to 70 runs. What is the value of n?

Options

    a) 5
    b) 6
    c) 7
    d) 8
    e) 9
Total Increase in score of n matches is 5n
Total increase + new average = New score
5n + 70 = 100
n = 6
User avatar
8to
Joined: 15 Jul 2021
Last visit: 27 Jun 2025
Posts: 7
Given Kudos: 15
Location: Bangladesh
Posts: 7
Kudos: 0
Kudos
Add Kudos
Bookmarks
Bookmark this Post
After century, total number matches be=n+1
then , 70(n+1)-65n=100
or, 5n=30
or n=6
So the value of 'n' be=6
Moderators:
Math Expert
102620 posts
PS Forum Moderator
698 posts