Some stuff

25% of what number is 16?

Remember in mathematics “of” means “multiplied by” or “times.”

So, 25% of what number is 16 can be written as 25% * X = 16
25% * X is the same as 1/4 * X or X/4
Once you write that as X/4 = 16 you can solve to get X = 64

What percent of 50 is 18?

Divide 18 by 50, then multiply by 100.

18/50 = .36 * 100 = 36%

What is 35% of 210?

\frac{35}{100} × 210=  73.5

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