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The sides of a triangular plot are in th...

The sides of a triangular plot are in the ratio of `3:5:7`and its perimeteris 300 m. Find its area.

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`a:b:c=3:5:7`
`a=3x=60`
`b=5x=100`
`c=7x=140`
`a+b+c=300`
`3x+5x+7x=300`
`15x=300`
`x=20`
...
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