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