A) 52%
B) 50%
C) 33%
D) 25%
Correct Answer: D
Solution :
Let the total marks in an examination be x. Then, passed marks \[=20%\text{ of }x+30\] \[=\frac{20x}{100}+30=\frac{x}{5}+30\] and also passed marks \[=\text{ }32%\text{ of }x-42\] \[=\frac{32x}{100}-42=\frac{8x}{25}-42\] \[\therefore \] \[\frac{x}{5}+30=\frac{8x}{25}-42\] \[\Rightarrow \] \[\frac{8x-5x}{25}=42+30\] \[\Rightarrow \] \[x=\frac{72\times 25}{3}=600\] \[\therefore \] Passed marks \[=\frac{600}{5}+30=150\] Hence, percentage of passed marks \[=\frac{150}{600}\times 100%=25%\]You need to login to perform this action.
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