Mathematics, 02.01.2020 10:31 ghadeeraljelawy

For a special concert by a popular band, the concert hall owner decided to charge $20 per ticket for the first "r" rows and $15 for the remaining rows. remember, there are a total of 40 rows with 20 seats in each row and the expense to operate this concert is $275.

For a special concert by a popular band, the concert hall owner decided to charge $20 per ticket for

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