The number of seats in the first row of a concert hall is 6. Th second row has 9 seats, the third row has 12 seats, and the four
th row has 15 seats. How many seats will be in the eighth row?
2 answers:
It's a pattern, you add three to every row. (1st row) 6+3=9, (second row) 9+3=12, (third row) 12+3=15, (fourth row) 15+3=18, (fifth row) 18+3=21, (sixth row) 21+3=24, (seventh row) 24+3=27 (eighth row) 27+3=30.
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