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The percentage is a fraction or a ratio in which the value of the whole is always 100.
Let's find 75% of what number will be 21.
Explanation:
Let the required number be a.
Then, 75% of a = 21
(75/100) × a = 21
a = 21 × (100 / 75 )
a = (21 × 100) / 75
a = 28