There are 48 students in Seokjin's class. One day, there were 37 students who did math homework and 42 students who did Korean homework. If there is no student who has not done both math homework and Korean homework, how many students have done both math homework and Korean homework?
37 42 [OP_ADD] 48 [OP_SUB]
var_a = 37
var_b = 42
var_c = var_a + var_b
var_d = 48
var_e = var_c - var_d
print(int(var_e))