GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 11 Dec 2019, 22:17

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

Andy solves problems 74 to 125 inclusive in a Math exercise. How many

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 59674
Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 16 Oct 2019, 00:18
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

76% (00:26) correct 24% (00:31) wrong based on 71 sessions

HideShow timer Statistics

VP
VP
avatar
D
Joined: 20 Jul 2017
Posts: 1145
Location: India
Concentration: Entrepreneurship, Marketing
WE: Education (Education)
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 16 Oct 2019, 00:44
1
Bunuel wrote:
Andy solves problems 74 to 125 inclusive in a Math exercise. How many problems does he solve?

A. 53
B. 52
C. 51
D. 50
E. 49


Numbers form an AP series {74, 75, 76, . . . . . . .125}
--> Last term = a + (n - 1)d
--> 125 = 74 + (n - 1)1
--> 125 = 73 + n
--> n = 52

IMO Option B
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 18 Aug 2017
Posts: 5473
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 16 Oct 2019, 04:53
1
Bunuel wrote:
Andy solves problems 74 to 125 inclusive in a Math exercise. How many problems does he solve?

A. 53
B. 52
C. 51
D. 50
E. 49

we can solve for consective terms ;

125-74 +1 ; 52
IMO B
Intern
Intern
avatar
B
Joined: 03 May 2019
Posts: 5
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 21 Oct 2019, 06:49
Dillesh4096 wrote:
Bunuel wrote:
Andy solves problems 74 to 125 inclusive in a Math exercise. How many problems does he solve?

A. 53
B. 52
C. 51
D. 50
E. 49


Numbers form an AP series {74, 75, 76, . . . . . . .125}
--> Last term = a + (n - 1)d
--> 125 = 74 + (n - 1)1
--> 125 = 73 + n
--> n = 52

IMO Option B





Hi! How can we deal with such a question, to find the numbers, when it is not in an A.P? Bunuel
GMAT Tutor
User avatar
S
Joined: 17 Sep 2014
Posts: 290
Location: United States
GMAT 1: 780 Q51 V45
GRE 1: Q170 V167
Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post Updated on: 25 Oct 2019, 00:55
Bunuel wrote:
Andy solves problems 74 to 125 inclusive in a Math exercise. How many problems does he solve?

A. 53
B. 52
C. 51
D. 50
E. 49


We are counting 74 to 125. If we subtract 73 on both ends we are counting 1 to 52 which is 52 numbers. Hence the formula for the number of consecutive terms is the range + 1.

Let's assume we were counting all the even-numbered questions between 74 and 125 (inclusive) instead, then we would start by finding the effective range first which is 74 to 124. Then we apply the same formula, but the range will be cut in half first because count only one number for every 2 numbers in this range, and finally don't forget to add 1. So (124-74)/2 + 1 = 26 would be the amount of even-numbered questions in between 74 and 125 inclusive.

Ans: B
_________________
Source: We are an NYC based, in-person and online GMAT tutoring and prep company. We are the only GMAT provider in the world to guarantee specific GMAT scores with our flat-fee tutoring packages, or to publish student score increase rates. Our typical new-to-GMAT student score increase rate is 3-9 points per tutoring hour, the fastest in the world. Feel free to reach out!

Originally posted by TestPrepUnlimited on 21 Oct 2019, 09:37.
Last edited by TestPrepUnlimited on 25 Oct 2019, 00:55, edited 1 time in total.
GMAT Tutor
User avatar
S
Joined: 17 Sep 2014
Posts: 290
Location: United States
GMAT 1: 780 Q51 V45
GRE 1: Q170 V167
Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post Updated on: 25 Oct 2019, 01:35
1
Most of the series on GMAT will be arithmetic. Otherwise, it could be manually counting or finding patterns. Take this question for example:

How many three-digit numbers have a tens digit of 7?

We start by writing a three-digit number, leaving the hundreds and units digit blank: _ 7 _. Notice that the hundreds digit can range from 1 to 9, and the units digit can range from 0 to 9. So that's 9 possibilities for the hundreds digits and 10 possibilities for the units digits. The seven is fixed so it's just 1 possibility, finally we multiply all those numbers to get 9*1*10 = 90 possibilities.

So there we go, that's pretty much all you need to know for GMAT in terms of counting numbers in a range! Also please see check out my 1st response as I include the general method of counting numbers within a particular range.

Roosh18 wrote:
Dillesh4096 wrote:
Bunuel wrote:
Andy solves problems 74 to 125 inclusive in a Math exercise. How many problems does he solve?

A. 53
B. 52
C. 51
D. 50
E. 49


Numbers form an AP series {74, 75, 76, . . . . . . .125}
--> Last term = a + (n - 1)d
--> 125 = 74 + (n - 1)1
--> 125 = 73 + n
--> n = 52

IMO Option B





Hi! How can we deal with such a question, to find the numbers, when it is not in an A.P? Bunuel

_________________
Source: We are an NYC based, in-person and online GMAT tutoring and prep company. We are the only GMAT provider in the world to guarantee specific GMAT scores with our flat-fee tutoring packages, or to publish student score increase rates. Our typical new-to-GMAT student score increase rate is 3-9 points per tutoring hour, the fastest in the world. Feel free to reach out!

Originally posted by TestPrepUnlimited on 21 Oct 2019, 09:44.
Last edited by TestPrepUnlimited on 25 Oct 2019, 01:35, edited 1 time in total.
e-GMAT Representative
User avatar
V
Joined: 04 Jan 2015
Posts: 3158
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 22 Oct 2019, 22:00

Solution



Given:
    • Andy solves math problems from question number 74 to 125, both inclusive

To find:
    • The number of problems solved by Andy

Approach and Working Out:
    • The total number of problems solved by Andy = 125 – 73 = 52

Hence, the correct answer is Option B.

Answer: B
_________________
Intern
Intern
avatar
B
Joined: 28 Jan 2019
Posts: 37
CAT Tests
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 26 Nov 2019, 09:20
For inclusive counting remember the equation:

(High - Low)/increment + 1

(125-74)/1 + 1 = 52
Target Test Prep Representative
User avatar
V
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8678
Location: United States (CA)
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many  [#permalink]

Show Tags

New post 02 Dec 2019, 20:42
Bunuel wrote:
Andy solves problems 74 to 125 inclusive in a Math exercise. How many problems does he solve?

A. 53
B. 52
C. 51
D. 50
E. 49


When we include both the first and last items, as in this question, we must add 1 to the difference.

Thus, the number of problems Andy solves is 125 - 74 + 1 = 52.

Answer: B
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

GMAT Club Bot
Re: Andy solves problems 74 to 125 inclusive in a Math exercise. How many   [#permalink] 02 Dec 2019, 20:42
Display posts from previous: Sort by

Andy solves problems 74 to 125 inclusive in a Math exercise. How many

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne