7. nelly spends 25% of her free time surfing the internet. if she spends approximately 2 hours per day surfing the internet, how many hours of free time does she have each day?
8. tyrese purchased a container of juice that contains 220 calories. the label says that 60% of the calories are carbohydrates. how many calories are from carbohydrates?

7.Answer=8hours

If she spends 25% of her free time on the internet. And she spends 2 hours on the internet, then we can infer the 2 hours is 25% of her free time. To find out her total amount of free time each day the following equation can be made (remember that 25% is the same as 25/100)...

   25        2hours
   =
  100           x hours

cross multiply
25x=200
divide both sides by 25
x=8 hours 

8.Answer=132 calories
If 60% of the 220 calories are carbohydrates, the following equation can be made (remember that 60% is the same as 60/100)...

   60        x
= ___
  100     220

Cross multiply
100x=13200
divide both sides by 100
x=132 calories are from carbohydrates