SOLUTION: A theater can seat 216 people. The number of rows is 6 less than the number of seats in each row. How many rows of seats are there ?

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Question 958039: A theater can seat 216 people. The number of rows is 6 less than the number of seats in each row. How many rows of seats are there ?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
R%2AS=216
R=S-6
Substituting,
%28S-6%29S=216
S%5E2-6S-216=0
%28S-18%29%28S%2B12%29=0
Only the positive solution makes sense here.
S-18=0
S=18
Then,
R=18-6
R=12
12 rows with 18 seats