A puffer fish can be modeled by the following sphere.
When the fish is puffed its diameter is 5 inches. This tells us the radius of the sphere is r= 52= 2.5 inches. Let's find its surface area, S_\text{puffed}, using the formula for the surface area of a sphere.
When the fish is puffed, its surface area is 1.5 times its normal surface area, \textcolor{darkviolet}{S_\text{normal}}. Therefore, we have the equation \textcolor{darkorange}{S_\text{puffed}}=1.5\textcolor{darkviolet}{S_\text{normal}}. Let's substitute 78.54 for \textcolor{darkorange}{S_\text{puffed}} and find the normal surface area.
