A) 100
B) 120
C) 150
D) 140
Correct Answer: A
Solution :
Total marks obtained by 120 candidates \[=120\times 85\] \[=4200\] Let the number of successful candidates \[=x\] \[\therefore \] The number of unsuccessful candidates \[=(120-x)\] \[\therefore \] According to question, \[4200=x\times 39+(120-x)15\] \[\Rightarrow \] \[4200=29x+1800-15x\] \[\Rightarrow \] \[24x=4200-1800\] \[\Rightarrow \] \[24x=2400\] \[\Rightarrow \] \[x=100\] \[\therefore \] The number of successful candidates = 100You need to login to perform this action.
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