OG 12th ED DS62 Timing Question

[piyushdabomb]

Guys,

For the DS Qn #62, try it and let me know how long its taking you to get an answer.

My first attempt took me 2:45 to answer the question and my second attempt took me 3:10 to answer the question. Is this question supposed to be a question I need to know how to do in under 2 minutes?

How do I know if I'm realistically supposed to answer a question in under 2 minutes or not without constantly posting my question (like this one) here?

[[email protected]]

Can you post this question please ?

[papgust]

Moved to Data Sufficiency folder!

[piyushdabomb]

I would, but it's in the OG book. Why not try it?

The problem is that I'm at work and it'd be wrong if I just took out my book right now in front of my colleagues!

[student22]

Sure, I'll post it and the question should only take 30seconds tops to solve, I'll go over my solution and reasoning.

Code: Select all

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person. What is the charge for each additional person?

(1) The daily cost per person for 4 people sharing the cost of a room equally is $45.
(2) The daily cost per person for 2 people sharing the cost of a room equally is $25 more than the corresponding cost for 4 people.

OA: D


Let x be dollars (as stated in the question).

Statement 1:

120 + x(4 - 1) = 45 --> That's all you need, you isolated 1 variable. No need to solve any further. Suff.

Statement 2:

120 + x(2 - 1) = 120 + x(4 - 1) + 45 --> Same deal, you isolated x. No need to solve any further. Suff.

[gmatmachoman]

Sure, I'll post it and the question should only take 30seconds tops to solve, I'll go over my solution and reasoning.

Code: Select all

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person. What is the charge for each additional person?

(1) The daily cost per person for 4 people sharing the cost of a room equally is $45.
(2) The daily cost per person for 2 people sharing the cost of a room equally is $25 more than the corresponding cost for 4 people.

OA: D


Let x be dollars (as stated in the question).

Statement 1:

120 + x(4 - 1) = 45 --> That's all you need, you isolated 1 variable. No need to solve any further. Suff.

Statement 2:

120 + x(2 - 1) = 120 + x(4 - 1) + 45 --> Same deal, you isolated x. No need to solve any further. Suff.

I amnot sure if i can finish in 30 secs.I took more than a minute...(but correct soln)
The step above mentioned by the other user is NOT correct.

st 1:120 + 3x =45(4) = 180.
st 2:(120 + x )/2= ((120 +3x)/4) +25

solving any of the equations u shuld get X=20$.

SO D....

After all GMAT cant ask our IIT maths...so GMAC need to be contended with tough English that really make us(atleast me) scary..Uffffffffffffffffffffff

[student22]

Good catch, I solved it too quickly and missed the part of per person. So yes you have to multiply by 4 in the first one and divide each one by 2 and 4 respectively on the second statement.

But my original point still stands, the question gives you three variables. X for dollars for additional persons AND let's say N for the number of additional persons AND the total cost T of the room.

What you should be looking for in each statement is an answer to 2 of those questions. Statement 1 gives you an answer to the total cost 45 * 4 and the number of people N which is 4. So you intuitively know without even writing an equation that you only have one variable left, X.

The second statement gives you N by giving you 2 and 4 people. And it answers the question of total cost by telling you the relative price, that the cost for 2 people is equal to + 25 for the cost of 4 people. This tells you that you only have X left to solve. Again, no need to even write an equation.

[[email protected]]

Guys,

For the DS Qn #62, try it and let me know how long its taking you to get an answer.

My first attempt took me 2:45 to answer the question and my second attempt took me 3:10 to answer the question. Is this question supposed to be a question I need to know how to do in under 2 minutes?

How do I know if I'm realistically supposed to answer a question in under 2 minutes or not without constantly posting my question (like this one) here?

Answer : D

Took me around 30 secs to do this. May be because I have done this problem earlier.
But in any case I dont think it should take more than 1 minute to complete. This would probably be categorized as a 600-700 level problem.