A) 24
B) 70
C) 96
D) 100
Correct Answer: D
Solution :
Let number of questions be answered correctly be x. |
Then, Number of questions be answered by giving \[=(120-x)\]. |
So. \[x\times 1+(120-x)\times \left( -\frac{1}{4} \right)=90\] |
\[\Rightarrow \,\,\,\,\,\,\,\,\,\,4x-(120-x)=380\] |
\[\Rightarrow \,\,\,\,\,\,\,\,\,\,5x=380+120=500\] |
\[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x=100\] |
Hence, he answered 100 answer correctly. |
So option [d] is correct. |
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