A work which could be finished in 7 days was finished 3 days earlier after 10 more men joined. The number of men employed was?
Choose the correct choice from the following answers
A) 22
B) 20
C) 60
D) 71
E) 11

Rationale: "x - - - - - - - 7 ( x + 10 ) - - - - 6 x * 7 = ( x + 10 ) 6 x = 60 \ answer : c"
Answer: C