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The ratio of efficiencies of A , B and C...

The ratio of efficiencies of A , B and C is 7 : 5 : 8. Working together, they can complete a piece of work in 42 days. B and C worked together for 21 days and the remaining was completed by A alone. The whole work was completed in :
A, B और C की कार्य क्षमता का अनुपात 7 : 5 : 8 है | एक साथ कार्य करते हुए, वे किसी कार्य को 42 दिनों में कर सकते हैं |B और C ने एक साथ 21 दिनों तक कार्य किया और शेष कार्य A ने पूरा किया | पूरा कार्य कितने दिनों में समाप्त हुआ ?

A

96

B

99

C

102

D

93

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