Simplify : \( \large\frac{0.728 \times 0.728 - 0.272 \times 0.272}{0.456} \)
If \( \large\frac{x}{y} =\frac{3}{5} \), then \( \large\frac{5x+2y}{5x - 2y}\) is equal to
Sum of squares of three positive numbers is 608 and they are in the ratio 2 : 3 : 5. Then, find the numbers.