Copper is two-tenths of an alloy, zinc is forty-six hundredths of an alloy, the rest is other metals

Copper is two-tenths of an alloy, zinc is forty-six hundredths of an alloy, the rest is other metals. what is the mass of the alloy if the mass of other metals is 153 grams.

Let us find what part of the alloy other metals make up, denoting the entire alloy as 1:
1 – 0.2 – 0.46 = 0.34.

Knowing that the mass of other metals is 153 grams, we will compose the proportion:
153 / 0.34 = x / 1, where x is the mass of the entire metal;
x = 153 / 0.34 = 450 grams.

The answer is the weight of the alloy is 450 grams.