4 സംഖ്യകളുടെ ശരാശരി 22 ആണ് അഞ്ചാമതായി 21 എന്ന സംഖ്യ കൂടി ചേർത്തപ്പോൾ പുതിയ ശരാശരി കണ്ടെത്തുക
A21
B21.8
C21.5
D22
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