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Percentage is a fraction or a ratio in which the value of the whole is always 100.
We know that, Percentage= (Value/Total Value)×100.
Explanation:
Let the number be y.
40% of y = 25
⇒ (40/100) × y = 25
⇒ (2/5) × y = 25
⇒ y = (25 × 5) / 2
⇒ y = 125/2 = 62.5