Question: After a visit to the newly opened aquarium, 40 percent of the aquarium visitors fell ill from a mysterious disease. If there were 500 visitors, how many of them did not fall ill?
Answer with step-by-step thinking: If there were 500 visitors, and 40% of them fell ill, the number of visitors who fell ill is 40 / 100 * 500 = 200 people. The number of visitors who did not get ill is 500 - 200 = 300.
So the answer is 300.

Question: Dylan filled his glass with ice cubes before he poured his soda into it. He counted and there were 8 ice cubes in his glass. Later when he prepares a pitcher of lemonade he puts two times as many ice cubes in the pitcher. Then it is time to refill the ice cube trays which have 12 spaces each for ice cubes. How many trays does Dylan need to fill if he used exactly all the ice they had in them?
Answer with step-by-step thinking: Dylan uses 8 ice cubes in his glass plus 2 x as many for the pitcher of lemonade, 8 x 2 = 16 ice cubes. Those 16 ice cubes + the 8 before means that the ice cube trays originally held 16 + 8 ice cubes = 24 ice cubes. Each ice cube tray holds 12 ice cubes, 24 ice cubes / 12 spaces in the trays = 2 total ice cube trays.
So the answer is 2.

Question: Caleb is baking a birthday cake for his grandfather. His grandfather is turning 79 years old. Caleb puts three colors of candles on the cake. He puts one candle for each year for his grandfather. He puts 27 yellow candles, 14 red candles and the rest are blue candles. How many blue candles did he use?
Answer with step-by-step thinking:
Caleb has put 27 + 14 = 41 yellow and red candles. So, he used 79 - 41 = 38 blue candles.
So the answer is 38.