In a certain conference room each row of chairs has the same number of chairs, and the number of rows is 1 less than the number of chairs in a row. How many chairs are in a row?
(1) There is a total of 72 chairs
(2) After 1 chair is removed from the last row, there is a total of 17 chairs in the last 2 rows
Can someone help sift through all of this seemingly superfluous information?
1st suff, n*(n-1)=72, where n is an intenger.
2nd suff, since the number of chairs in one row is the same.
R is the number of chairs in a Row
2R=17+1-----> yeilds only one solution for R=9.
thus D, initial answer (wrong) was B.