A) 100
B) 120
C) 150
D) 140
Correct Answer: A
Solution :
Let the number successful students = x \[\therefore \] Number of unsuccessful students \[=120-x\] According to the question, \[x\times 39+(120-x)\times 15=120\times 35\] \[\Rightarrow \] \[39x-15x+1800=4200\] \[\Rightarrow \] \[24x=4200-1800=2400\]\[\Rightarrow \]\[x=100\]You need to login to perform this action.
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