മൂന്ന് കുട്ടികളുടെ ഇപ്പോഴത്തെ വയസ്സിന്റെ തുക 30. എങ്കിൽ മൂന്നുവർഷത്തിന് ശേഷം അവരുടെ വയസ്സിന്റെ ശരാശരി എത്ര ?
A11
B13
C12
D15
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