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"x" is 100%, and 42 is 15% of that, so, what's "x"?

[tex]\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ x&100\\ 42&15 \end{array}\implies \cfrac{x}{42}=\cfrac{100}{15}\implies x=\cfrac{42\cdot 100}{15}[/tex]
Write 15% as a fraction= 15/100= 3/20 times x=42 thats one equation. 
3/20x=42
x= 42* 20/3 (reciprocal)
x=14*20
x=406

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