Which number should be subtracted from 7,12,18 such that resultant numbers are in continued proportion
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like this..

⇒ (16 - x)2 = (12 - x)(21 - x)
⇒ 256 + x2 – 32x = 252 - 33x + x2
⇒-32x + 33x = 252 – 256
⇒ x= -4
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