This expression is factored completely. However, if we foil, we can make it to it's original expression.
When you foil, you get:

Simplify.

There are 15,500 sheets of paper
Find the LCD of both fractions and that is 45.
Make the denominators the same as the LCD
Simplify, now denominators are the same
join the denominators
simplify
Answer: 23/45
takes her 20 minutes to walk 1/2 a mile
2 miles=80 minutes
1/4= 10 minutes i think
so 80+10=1 1/2
{This is not my work!!!}