1. There are 800  animals on a farm. Three-fourths of them are cows. Of the cows, about 60% are white. How many cows on the farm are not white?   600   320   360   240   200   Hint Half-n-half Clue   2. A university has 2000 graduate students. The number of undergraduate students is 4  / 3  times the number of graduate students. What fraction of the students in the university are undergraduates?   4 / 3   3 / 7   7 / 4   4 / 7   7 / 3   Half-n-half Clue   3. Consider a square with side of length a, and an an isosceles right triangle with one side of length a and hypotenuse of length b. What is the sum of the areas of the square and the triangle?   2a2/3   a2 + ab/2   2a3b   a3b/2   3a2/2   Half-n-half Clue   4. If x + y = 15 and 5 x - y = 15, then x - y is equal to   15   -5   5   -45   0   Half-n-half Clue