You bought 18 boxes, including boxes of 50 tangerines each and boxes of 70 tangerines each. If you counted these tangerines individually and there were 1020 in total, how many boxes of 70 did you buy?
1020 50 18 [OP_MUL] [OP_SUB] 70 50 [OP_SUB] [OP_DIV]
var_a = 1020
var_b = 50
var_c = 18
var_d = var_b * var_c
var_e = var_a - var_d
var_f = 70
var_g = 50
var_h = var_f - var_g
var_i = var_e / var_h
print(int(var_i))