context: ###List of Questions
  (1) What is twenty-five eighths of a kilometer in meters?
  (2) Calculate prob of picking 3 f when three letters picked without replacement from {f: 4, n: 3}.
  (3) Suppose -3 = -2*g + 7. Let j = g - -8. Calculate the greatest common divisor of 143 and j.
  (4) Suppose 0 = -2*v - r + 3, 2 - 11 = -5*v - r. Solve s - v = 3*g, s = -2 + 1 for g.
  (5) Calculate 3805*0.5.
q_1: (1) What is twenty-five eighths of a kilometer in meters?
q_2: (2) Calculate prob of picking 3 f when three letters picked without replacement from {f: 4, n: 3}.
q_3: (3) Suppose -3 = -2*g + 7. Let j = g - -8. Calculate the greatest common divisor of 143 and j.
q_4: (4) Suppose 0 = -2*v - r + 3, 2 - 11 = -5*v - r. Solve s - v = 3*g, s = -2 + 1 for g.
q_5: (5) Calculate 3805*0.5.