There are three schools A, B and C. The sum of the students in schools A and C is 210. If the number of students in school A is 4 times the number of students in school B, and the number of students in school C is 3 times the number of students in school B, what is the number of students in school B?
210 4 3 [OP_ADD] [OP_DIV]
var_a = 210
var_b = 4
var_c = 3
var_d = var_b + var_c
var_e = var_a / var_d
print(int(var_e))