Edexcel IGCSE Math A 4.4.G compound measures

Practise compound-measure questions by selecting the correct formula, converting units and rearranging to find the missing quantity.

Exam points

Convert speeds between metres per second and kilometres per hour with clear working.
Use density, mass and volume relationships to calculate a missing quantity.
Rearrange compound-measure formulae and keep the final units consistent.

[Maximum number: 2]

The mass of a silver coin is 48.3 g
The density of silver is $10.5 \mathrm{~g} / \mathrm{cm}^{3}$
Work out the volume of the silver coin.
$\mathrm{cm}^{3}$

\rho=\frac{m}{V}

10.5=\frac{48.3}{V}

V=\frac{48.3}{10.5}=4.6

Final answer:

4.6\text{ cm}^3

M1 for substituting 10.5 and 48.3 correctly into a correct formula for density.
A1; allow $\frac{23}{5}$ or $4\frac35$ oe.

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4.4.G Compound measure such as speed, density and pressure question 1