Answer :
To solve this problem, recall that the area of a rectangle is given by the following formula:
[tex]A=wide\times length.[/tex]Therefore, the area of the stage is:
[tex](15\frac{1}{2}\times20)ft^2.[/tex]Converting the mixed number to an improper fraction, you get:
[tex]15\frac{1}{2}\times20=\frac{31}{2}\times20.[/tex]Computing the multiplication you get:
[tex]310.[/tex]