Melissa wants to make some dresses to sell at the upcoming festival. She has 56 square meters of fabric to make them. She knows that each dress takes 4 square meters of fabric and 3 hours to make. How many hours does she have to work? Let's be accurate as possible.
Each dress takes 4 square meters of fabric to make, so the number of dresses she can make will be 56 / 4 = 14 dresses. Each dress takes 3 hours to make, thus she will have to work 14 dresses x 3 hours / dress = 42 hours.
The answer: 42.