IN: Write the next sentence in this paragraph:
How to calculate roof runoff
Determine the footprint of your structure (f) in square feet :
Measure along the length of the house or building and along the width of the house or building (in feet). Multiply the two figures together to obtain the square footage of your roof.
Determine the percentage of water collected from each downspout (p).

OUT: Count the number of downspouts coming from your roof. Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout.

IN: Write the next sentence in this paragraph:
How to make your labrador retriever happier
Walk your lab often.
Labs are very active dogs, especially in the first few years of their lives. They will have a lot of energy to spare every day, so a few long walks will become part of your daily routine.

OUT: This will not only help exercise your pup, but also keep him happy. Make sure you spend at least 20-30 minutes walking your lab.

IN: Write the next sentence in this paragraph:
How to be a good subway customer
Be prepared by knowing what you want to order.
Inform them if you have any, or if you are taking advantage of a sale.
Start by telling the employee how many, what size, and what type of bread you want.

OUT:
" i'll have one foot-long on sourdough ". Note that, after they have the bread out and cut, you should inform them what type of sandwich you want, what kind of cheese, and if it is to be toasted or not.