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Hello:

I saw this calculation in an old textbook and I'm curious to know how it produces the answer.

16 = 4% X ?

Divide 16 and 4% by 4 ---> 16/4 = 4%/4 equals 4 = 1%.

Now multiply 4 and 1% by 100 the result is 400 = 100%.

400 is the answer.

Can you explain more about how this usual calculation produces the correct answer?

I thank you for your reply.

So if you want 4% of something, then that's definitely a small portion, right? Which means a small portion of this unknown number x is equal to 16. Since dividing by 2 is the same as multiplying by one half, diving by one half is the same as multiplying by 2. Now, since you're dividing by .04, which is approximately 1/25, you're simply multiplying the number by 25. So it's basically 16*25, which is equal to 400.

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