Find the average of even numbers from 1 to 30 ?
A12
B30
C15
D16
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30 ആളുകളുടെ ശരാശരി വയസ്സ് 10 ആണ്. ഒരാളും കൂടി വന്നു ചേര്ന്നപ്പോള് ശരാശരി വയസ്സ് 11 ആയി വര്ദ്ധിക്കുന്നു. എങ്കില് പുതുതായി വന്നു ചേര്ന്ന ആളിന്റെ വയസ്സ് എത്ര ?