Question

16 is 25% of what number

Answer 1

To set this as an equation, you could use 16 = x/4. X = 64

Answer 2

'is' in mathematics means equal
'of' in mathematics means multiplication

If we translate "16 is 25% of what number" into a mathematical equation, we get:

16 = 25% * x

25% can also be expressed as 25/100, since % or percent means over 100.

16 = 25/100 * x
16 = 0.25 * x

x = 16/0.25

x = 64

16 is 25% of 64.