A) 240
B) 100
C) 180
D) 140
Correct Answer: D
Solution :
\[\frac{n}{2}+\frac{n}{4}+\frac{n}{5}+7=n\Rightarrow \frac{19n}{20}+7=n\] \[7=20\,n-19n\Rightarrow \,7\times 20=n\Rightarrow n=140\] So, the number of Cows \[=\underline{\mathbf{140}}\]You need to login to perform this action.
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