Step-by-step reasoning process: Half of the marbles are white, so there are 50 / 2 = 25 white marbles. Green marbles are only 50% as many as yellow marbles, so there are 50 / 100 * 12 = 6 green marbles. So currently we know that we have 25 + 12 + 6 = 43 marbles. The rest are red, so there are 50 - 43 = 7 red marbles.
[Q & A] The question is George collected 50 marbles in white, yellow, green, and red. Half of them are white, and 12 are yellow. There are 50% fewer green balls than yellow balls. How many marbles are red?
The answer is 7

Step-by-step reasoning process: Karen makes $3000 / (3 / 4) = $4000 per month. In three months, Karen would make a total of $4000 * 3 = $12000. To make the same amount of money John would need to work $12000 / $3000 = 4 months.
[Q & A] The question is Jon makes 3/4's the salary that Karen makes. John makes $3000 per month. How long will it take him to make the same amount of money that Karen does in 3 months?
The answer is 4

Step-by-step reasoning process: He spends 360 / 60 = 6 hours driving. That means the trip takes 6 + 1 = 7 hours.
[Q & A] The question is James drives to Canada at 60 mph. It is a distance of 360 miles. He has a 1 hour stop along the way. How long does he take to get to Canada?
The answer is 7

Step-by-step reasoning process: He saw 25 total vehicles because 12 plus 13 equals 25. He saw 100 wheels because 25 times 4 equals 100.
[Q & A]
The question is Tommy goes for a run around his neighborhood and decides to calculate how many wheels he saw. All the trucks in his neighborhood have 4 wheels and all the cars in his neighborhood also have 4 wheels. If he saw 12 trucks and 13 cars, how many wheels did he see?
The answer is 100