[Question]: At the aquarium, there are twice as many sharks as stingrays. If there are 28 stingrays, how many fish are there?
[Answer]: If sharks are twice the number of stingrays, then the number of sharks at the aquarium is 2 sharks / stingray * 28 stingrays = 56 sharks. The number of fish in the tank is 56 sharks + 28 stingrays = 84 fish.
So the answer is 84.

[Question]: For 6 weeks in the summer, Erica treats herself to 1 ice cream cone from the ice cream truck. Monday, Wednesday and Friday she gets a $2.00 orange creamsicle. Tuesday and Thursday she gets a $1.50 ice cream sandwich. Saturday and Sunday she gets a $3.00 Nutty-Buddy. How much money does she spend on ice cream in 6 weeks?
[Answer]: Mon, Wed, Fri she gets a $2.00 orange creamsicle so that's 3 days * $2 / day = $6.00. Tue and Thur she gets a $1.50 ice cream sandwich so that's 2 days * $1.50 / day = $3.00. Sat and Sun she gets a $3.00 nutty - buddy so that's 2 days * $3 / day = $6.00. In one week she spends $6 + $3 + $6 = $15.00. Over 6 weeks she spends 6 weeks * $15 / week = $90.00.
So the answer is 90.

[Question]: The New York City Council bought 200 streetlights to modernize its squares. But they don't have enough squares to use all the streetlights bought. Knowing that there are 15 squares in New York and that each park will have 12 new streetlights bought by the city council, how many unused streetlights will remain?
[Answer]:
So the total number of streetlights that will be used is 15 squares * 12 streetlights / square = 180 streetlights. There will be 200 streetlights - 180 streetlights = 20 streetlights unused.
So the answer is 20.