Answer the following question.
Daria is raising money for a new vacuum cleaner. So far, she has collected $20 in her piggy bank and has decided to put $10 in it each week. If the vacuum cleaner costs $120, how many weeks will it take her to raise enough money to cover this expense?
Step-by-step reasoning process: The vacuum cleaner costs $120, so Daria needs 120 - 20 = $100 more. Daria will need 100 / 10 = 10 more weeks, to be able to buy the vacuum cleaner.
The answer is 10.

Answer the following question.
Harly's animal shelter has 80 dogs. She adopts out 40% of them but then has to take back 5 because of personality conflicts with other dogs in their adopted homes. How many dogs does she have now?
Step-by-step reasoning process: First find how many dogs are adopted out: 80 dogs * 40% = 32 dogs. Then subtract the number of dogs adopted out from the total number of dogs and add the number who were returned to find the final number of dogs: 80 dogs - 32 dogs + 5 dogs = 53 dogs.
The answer is 53.

Answer the following question.
Lea bought one book for $16, three binders for $2 and six notebooks for $1. Calculate the total cost of her purchases.
Step-by-step reasoning process: The binders cost 3 binders * $2 / binder = $6. The notebooks cost 6 notebooks * $1 / notebook = $6. The amount of Lea's purchases is: $16 + $6 + $6 = $28.
The answer is 28.

Answer the following question.
Janice adds 2 tablespoons of koolaid power and 16 tablespoons of water to a jug. She leaves it out long enough for 4 tablespoons of water to evaporate. Then she quadruples the amount of water in the jug. What percentage of the liquid in the jug is koolaid powder?
Step-by-step reasoning process: First find how many tablespoons of water are left after the evaporation: 16 tbs - 4 tbs = 12 tbs. Then multiply this number by 4 to find how much water is in the jug after Janice refills it: 12 tbs * 4 = 48 tbs. Now add the 2 tablespoons of koolaid powder to find the total volume of the liquid in the jug: 48 tbs + 2 tbs = 50 tbs. Now divide the volume of the koolaid powder by the total volume and multiply by 100% to find the percentage of the liquid that's koolaid: 2 tbs / 50 tbs * 100% = 4%.
The answer is 4.