The first row of an auditorium has 11 seats. Each following row has 7 more seats than the previous row. How many seats are in the twentieth row?
Show hints
- There are 19 transitions between the first and twentieth rows.
- Calculate 11 + 19 × 7.
Show the answer and solution
Answer: 144
There are 19 transitions from the first row to the twentieth, each adding 7 seats. Thus, 11 + 19 × 7 = 144 seats.