12 സംഖ്യകളുടെ ശരാശരി 20. ഒരു സംഖ്യകൂടി ചേർത്തപ്പോൾ ശരാശരി 19 എന്നുകിട്ടി. എങ്കിൽ കൂട്ടിച്ചേർത്ത സംഖ്യ ഏത് ?
A38
B19
C7
D10
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