The number, whose square is equal to the difference of the

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The number, whose square is equal to the difference of the squares of 75.15 and 60.12, is

Let the number be x. Then,
x² = (75.15)² – (60.12)²
= (75.15 + 60.12) (75.15 – 60.12)
= 135.27 × 15.03
= 2033.1081
⇒ x = √2033.1081
= 45.09