0.6 : c = 6. 0.3 * a = 0.9. 0.4 : x = 0.1. y * 5 = 1. 0.5 * c = 2.

Решение:

1. \( 0.6 : c = 6 \) \(\implies c = \frac{0.6}{6} = 0.1 \)
2. \( 0.3 \cdot a = 0.9 \) \(\implies a = \frac{0.9}{0.3} = 3 \)
3. \( 0.4 : x = 0.1 \) \(\implies x = \frac{0.4}{0.1} = 4 \)
4. \( y \cdot 5 = 1 \) \(\implies y = \frac{1}{5} = 0.2 \)
5. \( 0.5 \cdot c = 2 \) \(\implies c = \frac{2}{0.5} = 4 \)

Ответ: c = 0.1, a = 3, x = 4, y = 0.2, c = 4.