ACT数学习题及解析(2)！据留学360介绍，关于ACT数学，同学们应该定期进行模拟练习，全面的考题使学生了解所有的题型分布，大量的练习为学生不断提高解题技巧和速度提供了保障。下面我们来看一下美国高考ACT数学题......
Mr. Dietz is a teacher whose salary is $22,570 for this school year, which has 185 days. In Mr. Dietz‘s school district, substitute teachers are paid $80 per day. If Mr. Dietz’s takes a day off without pay and a substitute teacher is paid to teach Mr. Dietz‘s classes, how much less does the school district pay in salary by paying a substitute teacher instead of paying Mr. Dietz’s for that day?
F. $ 42
G. $ 80
H. $ 97
J. $105
K. $122
解析：The correct answer is F. To find Mr. Dietz‘s pay per day, you can divide his salary, $22,570, by the number of days he works,185. His pay per day is 22570/185, or $122. When Mr. Dietz takes a day off without pay and the school pays a subsititute $80, the school district saves the difference in these amounts, 122-80, or $42.
正确答案选F。先算出Dietz先生每天的平均工资，用22570除以185(可用计算器)，即122美元。再用122美元减去学校需要支付临时老师的费用80美元，即可算出学校结余的费用，为42美元。