Question

x,y का 15% है, x का कौनसा अंश उसमे स्वयं जोड़ा जाना चहिये , ताकि योग y का 25% हो ?​

Answer 1

Answer:

Assume adding f part of x makes it 25℅ of y .

Given

$x = y\times \frac{15}{100} \implies \frac{y}{x} = \frac{100}{15} \\ \\ x + x \times \frac{f}{100} = y \times \frac{25}{100} \\ \\ \ x(1 + \frac{f}{100} ) = y \times \frac{25}{100} \\ \\ 1 + \frac{f}{100} = \frac{y}{x} \times \frac{1}{4} = \frac{1}{4} \times \frac{100}{15} = \frac{5}{3} \\ \frac{f}{100} = \frac{5}{3} - 1 = \frac{2}{3} \\ f = 66.67\:\℅\:\:or\:\:{2 \over 3}part$