There is a string that is 90 centimeters (cm) long. 30 centimeters (cm) of the string was given to Yoojung, and 8/15 of the remaining string was used to tie the box. How many centimeters (cm) is the string used to tie the box?
90 30 [OP_SUB] 8/15 [OP_MUL]
var_a = 90
var_b = 30
var_c = var_a - var_b
var_d = 0.5333333333333333
var_e = var_c * var_d
print(int(var_e))