In mathematics, 'is' would be the equal sign. And 'of' would be the multiplcation sign. The missing number would be any variable.
56 is 28% of a number would be translated algebraically to:
[tex]56 = \frac{28}{100} \times x[/tex]
Solving for x, we get:
[tex]56 = \frac{28}{100} \times x[/tex]
Divide 28 on both sides
[tex]2 = \frac{x}{100}[/tex]
Multiply 100 on both sides
[tex]x = 200[/tex]
56 is 28% of 200
