Let amounts invested by x, y, z respectively
Therefore, \( \Large \frac{x \times 2 \times 5}{100} = \frac{y \times 3 \times 5}{100} = \frac{z \times 4 \times 5}{100} = k \)
=> \( \Large x = 10k, y = \frac{20}{3}k \ and \ z = 5k \)
Therfore, \( \Large x : y : z = 10k : \frac{20}{3}k : 5k \)
= \( \Large 30 : 20 : 15 = 6 : 4 : 3 \)