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In Figure, the ratio ofA D to D C is ...

In Figure, the ratio of`A D` to ` D C` is `3: 2.` If the area of ` Delta A B C\ i s\ 40 c m^2,` what is the area of ` Delta B D C ?` (a)`16 c m^2` (b) `24 c m^2` (c) `30 c m^2` (d) `36 c m^2`.

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