Posted by Anonymous on Sunday, November 1, 2009 at 12:19pm.
OK. First, what exactly is the question? How many seats in the last row? How many seats in the auditorium?
Let's figure a model to start.
Row 1: 40
Row 2: 43
Row 3: 46
Row 4: 49
and so on.
We want a formula that, given the row, will tell us how many seats.
Multiplying the row by 3 has to be part of the answer, since there are 3 extra in each row, but that doesn't account for the initial row.
We _could_ subtract 3 from the 40, imagining a row 0 with 37 seats that doesn't exist. Then our formula would be nice and neat:
Seats in row = 37 + row * 3
Or we could equally well start at 40 but subtract 1 from the number of rows, to get:
Seats in row = 40 + (row - 1) * 3
I'll use the first.
s = 3r + 37
So in row 49 we have 3*49 + 37 seats.
you have 49 rows. row 1 has 40 seats. all u do is 40(n). 49*3=147 + 40= 187
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