CP #23

From GMATClub.com's m#05:


4. Two watermelons, A and B, are on sale. Watermelon A has a circumference of 6 inches; watermelon B, 5 inches. If the price of watermelon A is 1.5 times the price of watermelon B, which watermelon is a better buy?

(Assume that the two watermelons are spheres).

(C) 2008 GMAT Club - [t]m05#4[/t]

• A
• B
• Neither
• Both
• Impossible to determine

 

Approach 1:

Value = Volume / Price

The volume is proportional to radius^3 and the circumference is proportional to the radius. Increasing the circumference by 6/5 = 20% increases the volume by 1.2^3 = 1.728 (72.8%) and increases the price by 50%.

The increase in value of Watermelon A is 1.728 / 1.5 = 15.3% .

GMATClub m#05

Again got 26/37 correct. This time percentile ranking was 45.2% 60.1% (for some reason, my percentile ranking just changed in that last 1 hour) - haha, I guess I did get a little better.

But I ran out of time on this test - had to pause in order to finish it. Yes, concentration was wavering.

Got frustrated with Probability and P&C questions - I really need to understand this topic before attempting any more questions. Maybe I should ask my school Math tutor if he'd help me out with this topic??? I'm seriously considering it now.

Incorrect Qs Summary:
Topic - No. of questions incorrect
Geo - 1
TSD - 1
Probability/P&C - 2
Inequalities - 1
Number Properties/Is x divisible by y type - 6!

Hmmm...

GMATClub m#02

26/37 correct on GMATClub's m#02. My percentile is 31.1% :p

Managed to finish the test on time. Some questions were pretty easy, some I answered incorrectly due to silly mistakes, and some I thought I got but apparently I didn't. Pretty good mix in terms of difficulty, although I got a little annoyed with the large number of questions from Number Properties.

Any comments on how this score is at this stage of studying? And post having worked on Time & Work (1 qs in the test - which i got wrong!), Time/Speed & Distance (0 qs. on test) and Averages/Mix/Allig (1-2 qs. on test)???