180 bottles of milk are divided into 3 cartons, and the bottles of milk in each carton are equally divided into 4 bags. How many bottles of milk are in one bag?
180 3 [OP_DIV] 4 [OP_DIV]
var_a = 180
var_b = 3
var_c = var_a / var_b
var_d = 4
var_e = var_c / var_d
print(int(var_e))