A) \[80\]
B) \[100\]
C) \[140\]
D) \[180\]
Correct Answer: C
Solution :
According to the quest,, \[\left( \frac{n}{2}+\frac{n}{4}+\frac{n}{5} \right)+7=n\] \[\Rightarrow \] \[\left( \frac{10+5n+4n}{20} \right)+7=n\] \[\Rightarrow \] \[\frac{19n}{20}+7=n\] \[\Rightarrow \] \[n-\frac{19n}{20}=7\Rightarrow \frac{n}{20}=7\] \[\Rightarrow \] \[n=20\times 7=140\]You need to login to perform this action.
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