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Chaining Two Ratios

Algebra 750
If $a:b= \frac{3}{4}$ and $b:c = \frac{2}{5}$, determine the value of $a:c$.
A$\frac{1}{5}$ B$\frac{3}{10}$ C$\frac{2}{5}$ D$\frac{1}{2}$