Question 1088080
In a theater there are1200 seats. The number of seats in each rows is 10 less than the numbers of rows? How many seats are there in each rows? 
<pre>Let number of seats in each row, be S
Then number of rows = S + 10
We then get the following NUMBER-OF-SEATS equation: S(S + 10) = 1,200
{{{S^2 + 10S - "1,200" = 0}}}
(S - 30)(S + 40) = 0
S, or {{{highlight_green(matrix(1,7, number, of, seats, in, each, "row:", 30))}}}        OR           S = - 40 (ignore)