Ratio of earnings of A and B is 8 : 9 respectively. If the earnings of A increase by 50% and the earnings of B decrease by 25%, the new rat… — Answer & Discussion

Ratio of earnings of A and B is 8 : 9 respectively. If the earnings of A increase by 50% and the earnings of B decrease by 25%, the new ratio of their earnings becomes 16:9 respectively. What are A's earnings?

ARs. 37,000
BRs. 28,500
CRs. 22,000
DCannot be determined

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Discussion 1

CCommunity24 May 2019

Solution
Let the earnings of A and B be Rs. $8x$ and $9x$ respectively.
A's new earnings after 50 % increase = $8x + \frac{50}{100} \times 8x = 12x$
B's new earnings after 25 % decrease = $9x - \frac{25}{100} \times 9x = \frac{27x}{4}$
=> Required ratio = $\frac{12x}{\frac{27x}{4}}$
= $\frac{16}{9}$ , which is already given.
Thus, we cannot determine A's earnings.