We have a question: Jim buys a package of 20 car washes. Since He bought a package he only has to pay 60%. A carwash normally costs 15 dollars. How much did he pay for the package?
And an answer: 180
So how you got the answer?
He had to pay for 20 * .6 = 12 car washes. That means he had to pay 12 * 15 = $180.

We have a question: 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?
And an answer: 165
So how you got the answer?
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.

We have a question: In the first team, Beth scored 12 while Jan scored 10. In the second team, Judy scored 8 while Angel scored 11. How many more points did the first team get than the second team?
And an answer: 3
So how you got the answer?
Beth and Jan scored a total of 12 + 10 = 22. Judy and Angel scored a total of 8 + 11 = 19. Thus, the first team scores 22 - 19 = 3 more points than the second team.