Step-by-step reasoning process: During one minute the metro sells 5 tickets, so they earn 5 * 3 = $15. So in 6 minutes they would earn 15 * 6 = $90.
[Q & A] The question is One ticket to the underground costs $3. In one minute, the metro sells an average of 5 such tickets. What will be the earnings from the tickets in 6 minutes?
The answer is 90

Step-by-step reasoning process: If Hiram's age is 40, when you add 12, his age becomes 40 + 12 = 52. If you add 4 from Hiram's age after adding twelve to his age, you get 52 + 4 = 56, which is twice Allyson's age. Allyson's age is 56 / 2 = 28 years.
[Q & A] The question is When you take Hiram's age and then add 12, you get 4 less than twice Allyson's age. If Hiram is 40 years old, how old is Allyson?
The answer is 28

Step-by-step reasoning process: Antonov was left with 60 - 20 = 40 pieces of candy. Therefore, he still has 40 / 20 = 2 packs of candy.
[Q & A] The question is Antonov bought 60 candies. He gave a pack of candy to his sister. If a pack of candy has 20 pieces, how many packs does Antonov still have?
The answer is 2

Step-by-step reasoning process: 40 / 4 = 10 kids went tubing. 10 / 2 = 5 kids went rafting and tubing.
[Q & A]
The question is There were 40 kids on Lake Pleasant. A fourth of the kids went tubing, but only half of the tubers went rafting. How many of the kids who joined the rafting excursion were also on the tubing excursion?
The answer is 5