context: ###List of Questions
  (1) Suppose -2*l + b = -4*b - 36, -104 = -4*l + 2*b. What is the tens digit of l?
  (2) Suppose 4*n - 8 = 4*u, -3*u - 2*n = 2*u - 4. Solve 9 = 3*v - u*v + r, v = 2*r + 3 for v.
  (3) Calculate -87 divided by 29.
  (4) What is 25/2 of a litre in millilitres?
  (5) Calculate prob of sequence igml when four letters picked without replacement from {g: 2, n: 1, l: 2, m: 1, i: 2}.
q_1: (1) Suppose -2*l + b = -4*b - 36, -104 = -4*l + 2*b. What is the tens digit of l?
q_2: (2) Suppose 4*n - 8 = 4*u, -3*u - 2*n = 2*u - 4. Solve 9 = 3*v - u*v + r, v = 2*r + 3 for v.
q_3: (3) Calculate -87 divided by 29.
q_4: (4) What is 25/2 of a litre in millilitres?
q_5: (5) Calculate prob of sequence igml when four letters picked without replacement from {g: 2, n: 1, l: 2, m: 1, i: 2}.