Josh has 9 dollars. He spent $1.75 on a drink, and then spent another $1.25. How much money, in dollars, does Josh have left? Give the rationale and then the answer.
Let's think step by step. Josh spent 1.75 + 1.25 = 3 dollars in total. Josh has 9 - 3 = 6 dollars left.. The answer is: 6.

Bob, a marathon runner, is preparing for a race. He runs a total of 70 miles in the 3 days leading up to the race. On day one he runs 20 percent of the total miles and on day 2 he runs 50 percent of the remaining miles. How many miles does he run on day three to complete the 70 miles? Give the rationale and then the answer.
Let's think step by step. Day 1: 70(.20) = 14 miles. 70 - 14 = 56 miles remaining. Day 2:56 / 2 = 28 miles. 56 - 28 = 28 miles remaining.. The answer is: 28.

At the Mystic Aquarium, sharks are fed four buckets of fish each day. The dolphins are fed half as many buckets as the sharks while the other sea animals are fed five times as many buckets as the sharks. How many weeks will 546 buckets of fish last? Give the rationale and then the answer.
Let's think step by step. The dolphins are fed 4 / 2 = 2 buckets of fish each day. The sea animals are fed 4 x 5 = 20 buckets of fish each day. So, the Mystic Aquarium needs 4 + 2 + 20 = 26 buckets of fish each day. Thus in a week, it needs 26 x 7 = 182 buckets of fish. Therefore, 546 buckets of fish will last for 546 / 182 = 3 weeks.. The answer is: 3.