ഒരു ഓഫീസിലെ മുഴുവൻ സ്റ്റാഫുകളുടെയും ശരാശരി ശമ്പളം പ്രതിമാസം 220 രൂപയാണ്. ഓഫീസർമാരുടെ ശരാശരി ശമ്പളം 500 രൂപയും നോൺ ഓഫീസർമാരുടേത് 110 രൂപയുമാണ്. ഓഫീസർമാരുടെ എണ്ണം 11 ആണെങ്കിൽ, ഓഫീസിലെ നോൺ-ഓഫീസർമാരുടെ എണ്ണം കണ്ടെത്തുക.
A54
B28
C41
D45
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