1. A university has 5000 graduate students. The number of undergraduate students is 8  / 7  times the number of graduate students. What fraction of the students in the university are undergraduates?   8 / 7   15 / 7   15 / 8   8 / 15   7 / 15   Hint Half-n-half Clue   2. If a and b are both odd numbers, then which of the following must be an odd number ?   ab + 1   2a + b + 1   a + b + 2   a + b   ab   Half-n-half Clue   3. If x + y = 16 and 4 x - y = 14, then x - y is equal to   16   -4   0   4   -34   Half-n-half Clue   4. After work, Mr. White drove 24  miles west, then 15  miles south, and finally 12  miles west to meet his sister. What is the shortest distance in miles from Mr. White's workplace to his sister's home?   45   cannot be determined   57   39   51   Half-n-half Clue