James has 18 chocolate bars to sell for the swim team. He sold 5 last week and 7 this week. How many more chocolate bars does he need to sell? Give the rationale and then the answer.
Let's think step by step. He has sold a total of 5 + 7 = 12 chocolate bars so far. James needs to sell 18 - 12 = 6 more chocolate bars.. The answer is: 6.

On Mary's birthday, her brother surprised her with $100. She spent a quarter of it on a new video game and then used a fifth of what was left on swimming goggles. How much money did she have left? Give the rationale and then the answer.
Let's think step by step. Mary spent 100 / 4 = 25 dollars on a new video game. So, after the video game purchase, Mary was left with 100 - 25 = 75 dollars. Mary then bought swimming goggles for 75 / 5 = 15 dollars. Mary had 75 - 15 = 60 dollars left.. The answer is: 60.

Sandi had $600. She spent half of it at a farmer's market. Gillian spent $150 more than three times Sandi's total. What is the total that Gillian spent at the farmer's market? Give the rationale and then the answer.
Let's think step by step. Sandi spent 600 / 2 = 300 dollars at the farmer's market. Gillian spent 300 * 3 + 150 = 1050 dollars at the farmer's market.. The answer is: 1050.