A) \[5:5:7\]
B) \[30:25:42~\]
C) \[30:20:49\]
D) None of these
Correct Answer: B
Solution :
Let the number of students in schools \[x,\] \[y\]and \[z\] be, \[5a,\]\[4a\] and \[7a\] respectively. New strength of school \[x=120%\] of\[5a\]\[=\left( \frac{6}{5}\times 5a \right)=6a.\]. New strength of school \[y=125%\] of\[7x=\frac{6}{5}\times 7x=\frac{42x}{5}\]. \[\therefore \] New strength of school \[z=120%\]of \[7x=\frac{6}{5}\times 7x=\frac{42x}{5}\] \[\therefore \]New ratio\[=6x:5x:\frac{42x}{5}=30:25:42.\]You need to login to perform this action.
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