The alloy contains 18 kg of zinc, 6 kg of tin and 36 kg of copper, which is the percentage of the alloy’s components.

Alloy M weight:

M = mts + mo + mm = 18 kg + 6 kg +36 kg = 60 kg.

The percentage of each metal in the alloy is equal to the ratio of the mass m of this metal to the mass of the alloy M, multiplied by a factor of 100%:

wts = (mts / M) * 100% = (18/60) * 100 = 30%;

wо = (mo / M) * 100% = (6/60) * 100 = 10%;

wm = (mo / M) * 100% = (36/60) * 100 = 60%.

Answer: The alloy contains 30% zinc, 10% tin and 60% copper.