Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 1810:00 AM PDT
-11:00 AM PDT
Join us in a live GMAT practice session and solve 25 challenging GMAT questions with other test takers in timed conditions, covering GMAT Quant, Data Sufficiency, Data Insights, Reading Comprehension, and Critical Reasoning questions.
May 1212:00 PM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products. Ends 6/1
May 1501:00 PM IST
-11:00 AM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score.- May 19
12:00 PM PDT
-01:00 PM PDT
Scoring 329 on the GRE is not always about using more books, more courses, or a longer study plan. In this episode of GRE Success Talks, Ashutosh shares his GRE preparation strategy, study plan, and test-day experience, explaining how he kept his prep.... - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
27 Jan 2020, 10:46
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
67% (02:05) correct
33%
(01:37)
wrong
based on 42
sessions
History
Date
Time
Result
Not Attempted Yet
Lisa has 45 coins, which are worth a total of $3.50. If the coins are all nickels and dimes, what is the difference between the number of dimes and the number of nickels?
(A) 5
(B) 10
(C) 15
(D) 20
(E) 25
(A) 5
(B) 10
(C) 15
(D) 20
(E) 25
Source: Master GMAT
Updated on: 27 Jan 2020, 12:23
Originally posted by sujoykrdatta on 27 Jan 2020, 11:29.
Last edited by sujoykrdatta on 27 Jan 2020, 12:23, edited 1 time in total.
Last edited by sujoykrdatta on 27 Jan 2020, 12:23, edited 1 time in total.
Kudos
Bookmarks
SajjadAhmad
We can easily solve by equations: d + n = 45 and 10d + 5n = 350
But let us try a different approach here.
Note: 1 nickel = 5 cents, 1 dime = 10 cents
There are 45 coins worth $3.50 = 350 cents
If all coins were dimes, the total value of the coins would have been 45 * 10 = 450 cents
Thus, we need to reduce the total value by 100 cents
If we convert a dime to a nickel, we would reduce the value of that coin by 5 cents
Thus, number of times such a change needs to be done so that the value falls be 100 cents = 100/5 = 20
Thus, there are 20 nickels and the remaining 25 are dimes
Thus, difference = 5
Answer A
27 Jan 2020, 11:42
Kudos
Bookmarks
Let the number of dimes = n and the number of nickel = 45-n
Now, 10n +5(45-n) = 350( 1 dime = 10 cents, and 1 nickel = 5 cents)
10n + 225 -5n = 350
5n =125
n = 25
Number of dimes = 25 and Number of nickels = 45-25 = 20
Difference between dimes and nickels = 25-20 = 5(A)
Now, 10n +5(45-n) = 350( 1 dime = 10 cents, and 1 nickel = 5 cents)
10n + 225 -5n = 350
5n =125
n = 25
Number of dimes = 25 and Number of nickels = 45-25 = 20
Difference between dimes and nickels = 25-20 = 5(A)
