12.A school bus has 10 double seats in each of 2 rows. Two students can sit in each double seat. If an empty bus starts out and makes two stops, picking up three times the number of students at the second stop as at the first stop, and if the bus is then filled to seating capacity, how many students got on the bus at the second stop?

　　A.5

　　B.10

　　C.15

　　D.20

　　E.30

　　答案：E

　　13.The daily rate for a hotel room that sleeps 4 people is $39 for one person and x dollars for each additional person. If 3 people take the room for one day and each pays $21 for the room, what is the value of x?

　　A.6

　　B.8

　　C.12

　　D.13

　　E.24

　　答案：C

　　14.A buzzer sounds every 15 minutes. If the buzzer sounded at 12:40, which of the following could be a time at which the buzzer sounded?

　　A.4:05

　　B.5:30

　　C.6:45

　　D.7:15

　　E.8:10

　　答案：E

　　15.The cost, in dollars, for an appliance repair at a certain company is 1.2p+20h, where p is the wholesale price of the parts, in dollars, and h is the number of hour it takes to repair the appliance. What is the cost of repairing an appliance if the wholesale price of the parts is$15 and it takes 2 hours to repair it ?

　　A.$12

　　B. $18

　　C. $20

　　D. $40

　　E. $58

　　答案：E

　　16.Three salespeople are paid commissions in proportion to the amount of their sales, which total $25,000, $40,000,and $60,000, respectively. If a total of $20,000 is allocated for these three commission, what is the amount of the largest commission paid?

　　A.$8,000

　　B.$8,400

　　C.$9,600

　　D.$10,000

　　E.$12,000

　　答案：C

　　17.The decorating committee for a dance plans to fringe the 3-inch-wide end of a streamer by making small cuts every 1/16 inch. How many cuts must be made to fringe the end?

　　A.45

　　B.46

　　C.47

　　D.48

　　E.49

　　答案：C