# Alloy of tin and lead contains 40% tin. What mass of alloy and what mass of pure

Alloy of tin and lead contains 40% tin. What mass of alloy and what mass of pure lead should be taken to obtain 40 kg of a new alloy containing 10% tin?

We find out how many kilograms of tin are in an alloy weighing 40 kg. Let’s make the proportion:

100% – 40 kilograms,

10% – x kilogram.

x kilogram = 10 * 40: 100 = 4 kilograms.

The alloy contains 4 kilograms of tin.

Find out how much alloy with a tin content of 40% you need to take:

x kilogram – 100%,

4 kilograms – 40%.

x kilogram = 4 * 100: 40 = 10 kilograms.

You need to take 10 kilograms of an alloy with a tin content of 40%.

Let’s calculate how much lead you need to take:

40 – 10 = 30 kilograms.

Answer: you need to take 30 kg of lead, and 10 kg of an alloy with 40% tin.

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