Tough and Tricky questions: Work/Rate Problems.
A group of 4 junior lawyers require 4 hours to complete a legal research assignment. How many hours would it take a group of three legal assistants to complete the same research assignment assuming that a legal assistant works at two-thirds the rate of a junior lawyer?
Source: Chili Hot GMAT  Choose the correct choice:
A) 13
B) 10
C) 9
D) 8
E) 5
# of people times the # of hours:   4*4= 
<gadget id="calculator">4*4</gadget>
<output>16</output>
16 --&gt; 4 lawyers do 16worksin 4 hours.   3*8/3= 24/3= 
<gadget id="calculator">24/3</gadget>
<output>8</output>
8 --&gt; 3 assistants do 8 worksin 8/3 hours (2/3*5= 10/3)   So, since the amount of work the assistants do is half the work the lawyers do, the time will be double, soANS 8
<result>D</result>
Tough and Tricky questions: Work/Rate Problems.
A group of 4 junior lawyers require 4 hours to complete a legal research assignment. How many hours would it take a group of three legal assistants to complete the same research assignment assuming that a legal assistant works at two-thirds the rate of a junior lawyer?
Source: Chili Hot GMAT