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  1. 4/5 of a certain number is 64, Half of that number is ?
    1. 32
    2. 40
    3. 80
    4. 16
Correct Option: B

Let the number be N,
Then 4N/5 = 64
⇒ N = 64 x 5/4 = 80
∴ Half of the number = 80/2 = 40


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