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DeltaLMN~DeltaPQR, 9xxA(DeltaPQR)=16xxA(...

`DeltaLMN~DeltaPQR`, `9xxA(DeltaPQR)=16xxA(DeltaLMN)`. If `QR=20`, then find `MN`.

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The correct Answer is:
`therefore " " MN = 15` untis
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