1. Which of the following is not a prime?   43   53   63   73   83   Hint Half-n-half Clue   2. Mike tests an electronic component in 22 minutes, whereas Nick takes only 14 minutes. If both electronic engineers start testing at 2:00 p.m., what is the first time they will finish testing a component at the same time?   3:54 p.m.   4:34 p.m.   4:54 p.m.   5:08 p.m.   7:08 p.m.   Half-n-half Clue   3. Which of the following is not a prime factor of 390?   2   3   5   7   13   Half-n-half Clue   4. 24 students are to be seated in rows parallel to the front of the classroom. There must be more than two rows, and more than two students in each row. If each row must have the same number of students, then the number of different arrangements possible is   4   5   6   7   8   Half-n-half Clue   5. Which of the following is not a multiple of 9?   27   36   37   54   99   Half-n-half Clue   6. Which of these is not a divisor (factor) of 112?   7   8   12   14   28   Half-n-half Clue   7. The sum of the product and quotient of 9 and 9 is   1   18   28   81   82   Half-n-half Clue