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25 Jan 2021, 18:51
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Let the total number of people be 100.
Let y be the total number of speeders <--- This is the count we want.
10% of 100 = 10 <--- Speeders who got a ticket.
20% x y = y/5 <---- Speeders who did not get a ticket.
80% x y = 4y/5 <----- Speeders who did get a ticket
4y/5 = 10
y = 12.5
Answer is B.
Let y be the total number of speeders <--- This is the count we want.
10% of 100 = 10 <--- Speeders who got a ticket.
20% x y = y/5 <---- Speeders who did not get a ticket.
80% x y = 4y/5 <----- Speeders who did get a ticket
4y/5 = 10
y = 12.5
Answer is B.
27 Jan 2021, 03:44
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gmat1220 ,why did we choose variable x when this problem can be solved without 'x' but with different answer(Answer = 30), please explain
27 Jan 2021, 17:55
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Saransh123
gmat1220 ,why did we choose variable x when this problem can be solved without 'x' but with different answer(Answer = 30), please explain
Hi Saransh123,
To start, the original poster that you're referring to has not logged into GMATClub in almost a year, so you might not receive a direct response from him/her. Most GMAT questions can be approached in more than one way, so when dealing with any individual prompt, you have 2 goals: correctly answer the question (in a reasonable amount of time, if possible) AND do your work in an efficient way (meaning that you don't want to over-commit and spend too much time on any one prompt).
From your post, it's not clear what method you used to answer this question, but if you read the other posts in the thread, you'll see that by TESTing VALUES and doing a little Algebra/Arithmetic, it's possible to answer this question relatively quickly.
GMAT assassins aren't born, they're made,
Rich
