A red powder of volume 25 $\mathrm{cm^3}$ and density 0.200 $\mathrm{g/cm^3}$ and a green powder of volume 40 $\mathrm{cm^3}$ and density 0.125 $\mathrm{g/cm^3}$ were mixed to form a yellow powder.

What is the average density of the yellow powder?

A0.005

\mathrm{g/cm^3}

B0.154

\mathrm{g/cm^3}

C0.163

\mathrm{g/cm^3}

D0.325

\mathrm{g/cm^3}

ZIMSEC Physics 5055/1 Paper 1, November 2017, Q3

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