I turned on the tap for 21 liters (L) for 6 minutes and received water in the bathtub that drained 0.3 liters (L) for 1 minute. If it took 22 minutes and 30 seconds to fill the bathtub, how many liters of water was in the bathtub at first?
21 6 [OP_DIV] 0.3 [OP_SUB] 22 30 60 [OP_DIV] [OP_ADD] [OP_MUL]
var_a = 21
var_b = 6
var_c = var_a / var_b
var_d = 0.3
var_e = var_c - var_d
var_f = 22
var_g = 30
var_h = 60
var_i = var_g / var_h
var_j = var_f + var_i
var_k = var_e * var_j
print(int(var_k))