Why Did I Get This Question Wrong?

Test Preparation ACT Preparation
1

<p>It’s #16 on the link:</p>

<p>[Kaplan</a> ACT 2009 Comprehensive Program - Google Books](<a href=“http://books.google.com/books?id=L0VjyeskB4QC&pg=PA350&lpg=PA350&dq=KAPLAN+In+the+table+below,+every+row,+column,+and+diagonal+must+have+equivalent+sums.+What+is+the+value+of+the+lower+left+cell+in+order+for+this+to+be+true?&source=bl&ots=iyRl_Lh8YN&sig=qD3v1TLuY1IVaMAm2j4a1XEPa3Q&hl=en&ei=JYjuTImfOMWblgfnuOnkDA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBMQ6AEwAA#v=onepage&q&f=false]Kaplan”>http://books.google.com/books?id=L0VjyeskB4QC&pg=PA350&lpg=PA350&dq=KAPLAN+In+the+table+below,+every+row,+column,+and+diagonal+must+have+equivalent+sums.+What+is+the+value+of+the+lower+left+cell+in+order+for+this+to+be+true?&source=bl&ots=iyRl_Lh8YN&sig=qD3v1TLuY1IVaMAm2j4a1XEPa3Q&hl=en&ei=JYjuTImfOMWblgfnuOnkDA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBMQ6AEwAA#v=onepage&q&f=false)</p>

<p>I chose K, and the back of the book says that K is incorrect because the diagonal isn’t equivalent to the rest of the sums. It freakin’ is! This one question is f’ed up, I swear it has a mistake >.< The book says the answer is G.? When I looked, G and K should both be right…?</p>

<p>I honestly think the book is right, but I’m just too stupid right now to see why lol. Can someone explain it to me?</p>

2

<p>G is the correct answer. Every column and row should add up to zero. In the second column, -4m + 0 +4m = 0. In the first column we have m + 2m + what? = 0. Solving for “what” gives us -3m. -3m also works in the bottom row since -3m + 4m + -m = 0. The reason k doesn’t work is: m + -4m + -m (the bottom row) doesn’t add up to zero.</p>

3

<p>Oh… I had to of taken the other rows into account. Thanks!</p>