Greetings of the day! Let's get straight to business! :)
Question:
The length of a rectangle is 3 inches, plus or minus an amount no greater than 1/2 inch, while its width is 2 inches, plus or minus an amount no greater than 1/4 inch. Which of the following could be the percentage by which the actual area of the rectangle is greater than or less than its nominal area of 6 square inches? Select all that apply.
A. -30%
B. -25%
C. +25%
D. +30%
Doubt:
I have understood most part of the question EXCEPT the second half of the question i.e
Which of the following could be the percentage by which the actual area of the rectangle is greater than or less than its nominal area of 6 square inches?
What does this even mean? How does the author conclude the answers to be B,C & D? Could you please help me decipher it?
I also wanted to ask you, i find the hard section of each strategy guide extremely tough. I find them similar to the monthly challenge problem. Although my main aim of doing this section(well any GRE problem for that matter) is build skills/have takeaways from each problem, the hard sections of the strategy guides are giving me really hard time. I end up writing almost all of the problems from this sections in my "Mistakes/Review log book".. Is this something that i should really worry about? Will i see problems of such difficulty level on the real test?