# Seats

Seats in the sport hall are organized so that each subsequent row has five more seats. First has 10 seats. How many seats are:

a) in the eighth row
b) in the eighteenth row

Result

a =  45
b =  95

#### Solution:

$a=10+5 \cdot \ (8-1)=45$
$b=10+5 \cdot \ (18-1)=95$

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