42% of an alloy was silver. If in a quantity of alloy there was 147 g of silver, what was the quantity of the other elements in the alloy?

Let the total quantity of the alloy be x grams. Since 42% of this alloy is silver: x x 42/100 = 147, so x = 147 x 100/42 = 350 g. The quantity of the other elements in the alloy is: 350 - 147 = 203 g.