She really sets herself up for that one. Rather like that scene from Spongebob with the "psychiatrist" and the word association game.
TakActually it’s more difficult to get the wrong answerCirno, try to do this problemSensei, I’ve finished itProbably impossible… after all she’s an idiotWho told you to get clever here…?This kind of problem is too too easy for a genius like meOh, that’s fastThe problem is just easyOkaaay♪Keine's Cram SchoolTakLet me see…4 + 6 = Youmu
Yo + Mu
1 + 9 + 3 = Iku-san
I + Ku + San
0 + 6 = Reimu
Rei + Mu
3 + 9 + 8 = Sakuya
Sa + Ku + Ya