Ratio and Proportion Practice Test 5

Let the initial earnings of A and B be Rs. 4x and Rs. 7x.
New earnings of A $=\frac{150}{100}\times 4\mathit{x}$ = Rs. 6x
New earnings of B $=\frac{75}{100}\times 7\mathit{x}$ = Rs. $\frac{21}{4}\mathit{x}$
Now, $6\mathit{x}:\frac{21}{4}\mathit{x}=8:7$
$\Rightarrow \frac{6\mathit{x}\times 4}{21\mathit{x}}=\frac{8}{7}$
This expression does not give the value of x. Hence, data is inadequate.