ഒരു ക്ലാസിലെ 30 കുട്ടികളുടെ ശരാശരി വയസ്സ് 10 ആണ്. ടീച്ചറിനെയും കൂടി ചേർത്തപ്പോൾ ശരാശരി വയസ്സ് 11 ആയി. എങ്കിൽ ടീച്ചറുടെ വയസ്സ് എത്ര?
A31
B34
C41
D40
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