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
Reverse engineering the 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?


Reasoning and answer: 4.5 gallons = 4.5 * 8 pints = 36 pints. 36 / 18 = 2 pints. Genevieve drank 2 * 3 = 6 pints of coffee.
The answer: 6
What was the question?
Question: 4.5 gallons of coffee were divided among 18 thermoses. Genevieve drank 3 thermoses. How many pints of coffee did Genevieve drink?


Hannah's earnings from the cookies is 40 x $0.8 = $32. Her earnings from the cupcakes is 30 x $2 = $60. Her total earnings for the cupcakes and cookies is $32 + $60 = $92. The cost of 2 sets of measuring spoons is 2 x $6.5 = $13. So, Hannah has $92 - $13 = $79.
The answer: 79
Reverse engineering the question: Hannah sold 40 pieces of cookies for $0.8 each and 30 cupcakes for $2 each. She used the money to buy 2 sets of measuring spoons for $6.5 each. How much money does she have left?


Reasoning and answer: Elrond was able to get 20 x 2 = 40 tulips. Therefore, the total number of tulips they were able to get is 40 + 20 = 60.
The answer: 60
What was the question?
Question: Arwen and Elrond picked some flowers. Arwen was able to get 20 tulips and Elrond was able to get twice as many tulips as Arwen did. How many tulips were they able to get in total?


Last week, she used 15 gallons * 0.2 = 3 gallons less fuel than she used this week. This means that she used 15 gallons – 3 gallons = 12 gallons of fuel last week. In total, Mary used 15 gallons + 12 gallons = 27 gallons of fuel.
The answer: 27
Reverse engineering the question: Mary used 15 gallons of fuel this week. Last week she used 20% less. How much fuel did she use in total for the two weeks?


There are 25 + 40 + 35 = 100 flowers total. There are 40 + 35 = 75 flowers that are not roses. Therefore, (75 / 100) * 100 = 75% of the flowers are not roses.
The answer: 75
Reverse engineering the question:
There are 25 roses in a garden. There are 40 tulips. There are 35 daisies. What percentage of flowers are not roses?