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Question id: 246. This question is similar to one that appeared in a GCSE Higher paper (specimen) for 2017. The use of a calculator is allowed.

### Mensuration

Harper mixes 300g of material $$X$$ and 150g of material $$Y$$ to make 450g of a compound material.

Material $$X$$ has a density of 20g/cm3.

Material $$Y$$ has a density of 15g/cm3.

Work out the density of the compound material.

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