Question

SM cinema has 24 seats in the 1st row, and each of the succeeding rows has 2 more seats than the row before it. If there are 16 rows of seats, what is its seating capacity?
16th row has ... 24 + (2 * 15) = 54

average row length ... (24 + 54) / 2

capacity is ... number of rows * average row length

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