Find the surface area if its 5% is 10 cm2.

The unknown unknown surface area is defined through the conditional variable “Y”.

Applying the information of such a problem, we get the following proportion: 5% relate to 10 cm ^ 2 as 100% relate to Y cm ^ 2.

Given the data of such a proportion, we will form this equation: 5 x Y = 10 x 100.

The outcome of solving this equation is as follows: Y = 100 x 10/5 = 100 x 2 = 200 cm ^ 2.

Answer: the area of the entire surface is 200 cm ^ 2.