context: ###List of Questions
  (1) Calculate -378 divided by 4.
  (2) How many hours are there in 15/4 of a week?
  (3) Let u = -968/171 + -1/171. What is the common denominator of u and -32/39?
  (4) Solve 56 - 20 = -3*i - 4*w, 5*i + 4*w = -44 for i.
  (5) Four letters picked without replacement from {k: 1, y: 1, p: 3, r: 7}. What is prob of sequence ppkp?
q_1: (1) Calculate -378 divided by 4.
q_2: (2) How many hours are there in 15/4 of a week?
q_3: (3) Let u = -968/171 + -1/171. What is the common denominator of u and -32/39?
q_4: (4) Solve 56 - 20 = -3*i - 4*w, 5*i + 4*w = -44 for i.
q_5: (5) Four letters picked without replacement from {k: 1, y: 1, p: 3, r: 7}. What is prob of sequence ppkp?