- Choice D
$$ \frac{AC}{AE}=\frac{AB}{AD} $$
$$ \frac{AC}{16}=\frac{8+7+6}{8}=\frac{21}{8} $$
$$ AC\times8=16\times21 $$
$$ AC=2\times21=42 $$
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$$ \frac{AC}{AE}=\frac{AB}{AD} $$
$$ \frac{AC}{16}=\frac{8+7+6}{8}=\frac{21}{8} $$
$$ AC\times8=16\times21 $$
$$ AC=2\times21=42 $$
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