The alloy contains 10 kg of tin and 15 kg of zinc. What is the percentage of tin and zinc in the alloy?

1) Determine what the total mass of the alloy is if we know that it contains 10 kg of tin and 15 kg of zinc.

10 + 15 = 25 kg.

2) Find out the percentage of zinc in the alloy, if we learned that the entire mass of the alloy is 25 kg, and zinc in it is 15 kg.

25 – 100%

15 – X%;

X = 15 * 100/25;

X = 60%.

3) Find out the percentage of tin in the alloy if its mass is 10 kg, and the entire mass of the alloy is 25 kg.

25 – 100%

10 – X%;

X = 10 * 100/25;

X = 40%.

Answer: zinc in the alloy contains 60%, and the tin content is 40%.