There are 320 red, white and black pieces. The ratio of the number of red and white pieces is 5:6, and the number of black pieces is 3 / 10 of that of white pieces No equation solution

Number of white pieces: 320 / (1 + 5 / 6 + 3 / 10) = 150
Number of red chessmen: 150 * 5 / 6 = 125
Number of black chessmen: 150 * 3 / 10 = 45
Checking calculation: 150 + 125 + 45 = 320

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