sub questions of the following.
1) There is an auditorium with 25 rows of seats. There are 10 seats in the first
row, 12 in the second row, 14 seats in the third row and so on. Find
the number of seats in the 20th row and also find how many total
seats are there in the auditorium?
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Answer:
Here,
the series is x+2
Therefore,
10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50+52+54+56+58
= 850 in total
48 in the 20th row
Answer: there are 850 seats in the auditorium.
and 48 seats in 20th row
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