A) 910
B) 1820
C) 455
D) 2730
Correct Answer: A
Solution :
Case I, Selected candidates \[=6x\] Unselected candidates \[=x\] According to the question, Total candidates \[=7x-30\] Selected candidates \[=6x-10\] \[\therefore \]Unselected candidates \[=(7x-30)-(6x-10)\] \[=7x-30-6x+10\] \[=x-20\] \[\therefore \] \[\frac{6x-10}{x-20}=\frac{7}{1}\] \[\Rightarrow \]\[7x-140=6x-10\] \[\Rightarrow \]\[7x-6x=140-10\] \[\Rightarrow \]\[x=130\] \[\therefore \]Initial number of candidates \[=7x=7\times 130=910\]You need to login to perform this action.
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