A) 180
B) 140
C) 240
D) 100
Correct Answer: B
Solution :
\[\frac{n}{2}+\frac{n}{4}+\frac{n}{5}+7=n\] or \[n-\frac{n}{2}-\frac{n}{4}-\frac{n}{5}=7\] or \[\frac{20n-10n-5n-4n}{20}=\frac{7}{1}\] or \[\frac{n}{20}=\frac{7}{1}\] or \[n=20\times 7=140\]You need to login to perform this action.
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