# Exam-Style Question on Compound Units

## A mathematics exam-style question with a worked solution that can be revealed gradually

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Question id: 540. This question is similar to one that appeared on a GCSE Higher paper in 2019. The use of a calculator is allowed.

The density of water (at 20°C) is 1.09 g/cm3.

The density of blood is 1.60 g/cm3.

Three litres of water are mixed with four litres of blood for a scientific experiment. Work out the density of the mixture giving your answer correct to 2 decimal places.

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