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If 25% of a certain number is 1600, what is 10% of the number?
  1. 640
  2. 40
  3. 1400
  4. 400
Explanation

If 25% of a certain number is 1600, we can set up an equation:

25% of x = 1600

Convert the percentage to a decimal:

0.25x = 1600

Divide both sides by 0.25:

x = 1600 / 0.25

x = 6400

So, the certain number is 6400.

Now, we need to find 10% of 6400:

10% of 6400 = 0.10 x 6400 = 640

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