Solution
Expression : 50% of (x - y) = 30% of (x + y)
=> $$\frac{50}{100} (x - y) = \frac{30}{100} (x + y)$$
=> $$5x - 5y = 3x + 3y$$
=> $$2x = 8y$$
=> $$\frac{y}{x} = \frac{1}{4}$$
$$\therefore \frac{y}{x}\% = \frac{1}{4} * 100 = 25\%$$
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