This is a question form the official GRE free practice test. I am doing these just to get a bit of a different flavor The options are:
Ann’s class has x students this semester. Paul’s class has one less than three times the number of students in Ann’s class.
Question:
Column 1: X(squared)
Column 2: 2X
A) Quantity in column 1 is greater
B) the Quantity in column 2 is greater
C) the quantities are equal
D) Can't tell from the given info
My answer is "D" because if Ann has 1 student, Paul has 2.
Column 1: X (squared) = 1(squared)=1
Column 2: 2(X) =2(2) =4
and column 2 is bigger
However, if Ann has 12 students, then Paul has 35 students. This leads to
Column 1 = 12(squared) =144
Column 2 = 32 (2)= 70
and column 1 is bigger.
here is the official answer:
"1. The correct answer is (A). To solve, substitute a value for x. If = 12, then Paul has 35 students."
12(squared) = 144
2(35) =70
Where am I going wrong here, why is the correct answer not D????
Thank you for your help.
http://www.greprepinfo.com/GRE_Practice_Test.pdf