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ATQ,
Let us assume one of the numbers is 'x'
Then, another number is = 4 × x = '4x'
So, x × 4x = 720
Or, 4x² = 720
Or, x² = 180
Or, x = 13.4 {Since the numbers are positive}
Required difference = {4 × (13.4) - 13.4} = (53.6 - 13.4) = 40.2
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