Reasoning & answer: CoT: Let X be the number of years before Fouad's age doubles Ahmed's age. So (X + 11) * 2 = X + 26. So X * 2 + 22 = X + 26. So X = 26 - 22 = 4 years.
The answer: 4
Question: Ahmed is 11 years old and Fouad is 26 years old. In how many years will Fouad's age be double Ahmed's current age?

Reasoning & answer: CoT: Twice the number of hours in a typical earth day is 24 * 2 = 48 hours. Eight hours less than twice the number of hours in a typical earth day is 48 - 8 = 40 hours. If the distance between these two planets is 4,000 parsecs, then the average speed on this voyage was 4000 / 40 = 100 parsecs per hour.
The answer: 100
Question: During the most recent voyage of the Starship Conundrum, the spacecraft traveled from Planet X to Planet Y in eight hours less than twice the number of hours in a typical earth day. If the distance between these two planets is 4,000 parsecs, what was the average speed, in parsecs per hour, of the Starship Conundrum during this most recent voyage?

Reasoning & answer: CoT: When Jennifer is 30 years old in ten years, her sister Jordana will be 3 * 30 = 90 years old. She's currently 10 years younger, so she's 90 - 10 = 80 years old.
The answer: 80
Question: Jennifer will be 30 years old in ten years. At that time, her sister Jordana will be three times as old Jennifer. How old is Jennifer's sister now?

Reasoning & answer: CoT: First find Jack's chances of getting bitten by an infected mosquito: 40% + 20% = 60%. The chance of being infected by a mosquito with after being bitten: 60% * 50% = 30%. Then find the chances of getting ill after receiving the vaccine: 30% * 50% = 15%.
The answer: 15
Question:
40% of the mosquitos in Jack's area are infected with malaria. 20% of the mosquitos are infected with Zika virus. Without a vaccine, the chances of getting infected with either virus after getting bitten by an infected mosquito are 50%. Jack is taking an experimental malaria vaccine that reduces the chances of getting infected after getting bitten by 50%. If Jack gets bitten by a random mosquito, what is the percentage chance he catches either Zika virus or malaria?