For every bike Henry sells, he is paid $8 more than he is paid to paint the bike. If Henry gets $5 to paint the bike, how much does he get paid to sell and paint 8 bikes? Give the rationale and then the answer.
Let's think step by step. Henry gets paid 5 + 13 = $18 for each bike painted and sold. In total, Henry will be paid 8 * 18 = $144 for painting and selling 8 bikes.. The answer is: 144.

John has started at a job he works every day 10 days ago. So far, he's made $250. How many more days must John work before he makes twice this amount, assuming he makes the same amount every day? Give the rationale and then the answer.
Let's think step by step. John has made $250 in 10 days, so this means he makes $250 / 10 = 25 dollars a day. Since John wants to make double his current amount, this means he wants to make 250 * 2 = 500 dollars. This means John needs to work 500 / 25 = 20 days in total to make 500. As John has already worked 10 days, this means he needs to work 20 - 10 = 10 more days to make his goal.. The answer is: 10.

Beth had 150 students in her 10th-grade class. The following year 30 more students join. In her final year, 15 students left. How many students did Beth have in her class at the end of her final year? Give the rationale and then the answer.
Let's think step by step. Beth had 150 students her 10th - grade year, and added 30 more the following for a total of 150 + 30 = 180 students. In her final year, 15 students left her class, bringing her total to 180 - 15 = 165 students.. The answer is: 165.