Manhattan GMAT Forums Forum Index

Manhattan GMAT Forums Forum Index » General Math Questions
Reply to topic
SCORETOP 31 GEMOETRY
payam@terra.com.br
Guest
Post Posted: Wed Aug 29, 2007 10:45 am Reply with quote
[img]

In the rectangular solid above, the three sides shown have areas 12, 15, and 20,
respectively. What is the volume of the solid?
A. 60
B. 120
C. 450
D. 1,800
E. 3,600
Answer:

[/img]
givemeanid
Guest
Post Posted: Wed Aug 29, 2007 1:10 pm Reply with quote
Let 3 sides be a,b and c

ab = 12, bc = 15, ac=20
Multiply all of the above: (abc)^2 = 12*15*20 = 3*4 * 3*5 * 4*5
Volume = abc = sqrt(3*4 * 3*5 * 4*5) = 3*4*5 = 60
SCORETOP 31 GEMOETRY
All times are GMT - 5 Hours  
Page 1 of 1  
  
  
Manhattan GMAT Forums Forum Index » General Math Questions
 Reply to topic