A sum of Rs. 4,300 is distributed among M, N and O, such that M receives 25% more than N and N receives 25% less than O. What is O’s share in the amount?

Let O's share = Rs. P

=> N's share = $\frac{75}{100} x P = \frac{3P}{4}$

M's share = $\frac{5}{4} x \frac{3P}{4} = \frac{15P}{16}$

$\frac{15P}{16} + \frac{3P}{4} + P = 4300=> P = 4300 x \frac{16}{43} = 1600$