A) 8
B) 32
C) 16
D) 12
Correct Answer: A
Solution :
(a): Let correctly attempted Q's be n Incorrectly attempted \[Q's=40-n\] \[\Rightarrow n\times 4+(40-n)(-1)=120\] \[\Rightarrow 4n-\left( 40-n \right)=120\] \[\Rightarrow 5n-40=120\] \[\Rightarrow 5n=160\] \[n=32\] \[\Rightarrow 40-n=8.\]You need to login to perform this action.
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