ഒരു വരിയിൽ ദീപക് ഇടത്ത് നിന്ന് 7-ാമതാണ്. മധു വലത്തു നിന്നും 12-ാമനാണ്. ഇവർ പരസ്പരം സ്ഥാനം മാറിയിരുന്നാൽ ദീപക് ഇടത്തുനിന്നും 22-ാമനാകും. എങ്കിൽ ആ നിരയിൽ എത്ര കുട്ടികളുണ്ട് ?
A31
B19
C33
D30
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