Step-by-step reasoning process: Black Copper Marans: 100(.20) = 20. BCM Hens:20(.80) = 16.
[Q & A] The question is A farm has 100 chickens. 20 percent are Black Copper Marans, and 80 percent of the Black Copper Marans are hens. How many BCM hens are there?
The answer is 16

Step-by-step reasoning process: The first station Tara stops at charges $3 for a gallon of gas, so for her 12 - gallon tank she spends 12 * 3 = 36 dollars. The second station Tara stops at charges $3.50 for a gallon of gas, so for her 12 - gallon tank she spends 12 * 3.5 = 42 dollars. The third station Tara stops at charges $4 for a gallon of gas, so for her 12 - gallon tank she spends 12 * 4 = 48 dollars. The fourth station Tara stops at charges $4.50 for a gallon of gas, so for her 12 - gallon tank she spends 12 * 4.5 = 54 dollars. Now that we know all the individual amounts, we add 36 + 42 + 48 + 54 = 180 dollars in gas in total.
[Q & A] The question is Tara's taking a road trip for the weekend. She drives for two days, stopping to fill up her gas tank each time from empty to full when she needs it. She visits 4 different gas stations in total, with the price of gas being $3, $3.50, $4, and $4.50 respectively at each. If Tara's car has a 12-gallon tank, how much does she spend on gas for her road trip?
The answer is 180

Step-by-step reasoning process: The magician works for 2 * 7 = 14 days. So the magician works 14 * 3 = 42 hours. So that means he pays 42 * 60 = $2520.
[Q & A] The question is Stan hires a magician for $60 an hour. He works 3 hours every day for 2 weeks. How much money does he pay the magician?
The answer is 2520

Step-by-step reasoning process: There are a total of 4 teams * 10 members per team = 40 team members. Each person receives 1 pair of competing roller skates + 1 pair of backup roller skates = 2 pairs of roller skates. So there are a total of 40 team members * 2 pairs of roller skates per team member = 80 roller skates. There were therefore 80 roller skates * 3 sets of laces per pair of roller skates = 240 sets of laces handed out.
[Q & A]
The question is At a roller derby, 4 teams are competing. Each team is made up of 10 members, and each member needs a pair of roller skates to compete in and another pair of skates as a backup. None of the skates have laces yet, so each member is offered 3 sets of laces per pair of skates. How many sets of laces have been handed out?
The answer is 240