Teacher Antonella and naughty student by Mistress Antonella

A naughty student pass the final exam of mathematics with his teacher Antonella.For each wrong answer, Mistress Antonella whips him with times number answered by the student, then She whips him with times number of the good answer.For each corporal punishment, she uses different accessories like Whips, Paddles, Flogger, and Crops.Imagine when the wrong answer come from the addition of 15 + 15 ....