Mathematics, 10.06.2021 08:20 ggdvj9gggsc

There are 20 rows of seats on a concert hall: 25 seats are in the 1st row, 28 seats on the 2nd row, 31 seats on the third row, and so on. How many seats are in the last row?

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There are 20 rows of seats on a concert hall: 25 seats are in the 1st row, 28 seats on the 2nd row,...