A) 3
B) 4
C) 7
D) 6
Correct Answer: D
Solution :
[d] According to question \[\frac{36+n}{50+n}=\frac{3}{4}\] \[36\times 4+4n=50\times 3+3n\] \[4n-\,3n=150-\,144\] \[n=6\]
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