Q: John drives 1000 miles a month. He needs to get an oil change every 3000 miles. He gets 1 free oil change a year. If an oil change costs $50, how much does he pay a year?
A: 150
Step-by-step reasoning process: He needs to get an oil change every 3000 / 1000 = 3 months. So he gets 12 / 3 = 4 oil changes a year. That means he pays for 4 - 1 = 3 oil changes a year. So he pays 3 * $50 = $150 a year.

Q: There are 50 oysters on the rocks at La Push Park and 72 crabs by the beach. Eric, who loves walking by the beach, makes a note of this and goes home. The next day, he realizes only half the number of Oysters were on the rocks, and only 2/3 the number of crabs as the previous day are on the beach. How many oysters and crabs did he count in total in the two days?
A: 195
Step-by-step reasoning process: The first day he saw 50 oysters + 72 crabs = 122 animals. On the second day, he saw 1 / 2 * 50 oysters = 25 oysters. The number of crabs by the beach on the second day was 2 / 3 * 72 crabs = 48. He saw 48 crabs + 25 oysters = 73 animals on the second day. The total for the two days is 73 animals + 122 animals = 195 animals.

Q: John's grill messes up and burns half his steak. He eats 80% of what isn't burned. If the steak was originally 30 ounces how much steak did he eat?
A: 12
Step-by-step reasoning process: There were 30 * .5 = 15 ounces of unburnt steak. So he ate 15 * .8 = 12 ounces of steak.

Q: A plumber is trying to decide which of three different jobs he should take to make the most money. The first job involves fixing three toilets and three sinks at an apartment complex. The second involves two toilets and five sinks at a different apartment complex. The third involves fixing one toilet, two showers and three sinks at a third apartment complex. If the plumber charges $30 to fix a sink, $40 to fix a shower and $50 to fix a toilet, what is the most money the plumber can earn if he can only choose one of these three jobs?
A: 250
Step-by-step reasoning process: If the plumber chooses the first job, he would earn 3 * 50 + 3 * 30 = $240. If he chooses the second, he'd earn 2 * 50 + 5 * 30 = $250. If he chooses the third, he'd earn 50 + 2 * 40 + 3 * 30 = $220. Therefore, the most money he can earn from one of these jobs is $250.