This is a question on relating proportions and our approach will be to cross-multiply.
[tex]1.1\colon42=3.3\colon x[/tex]This can be rearranged to get:
[tex]\begin{gathered} \frac{1.1}{42}=\frac{3.3}{x} \\ \text{Cross multiplying gives:} \\ 1.1x=3.3\times42 \\ x=\frac{3.3\times42}{1.1} \\ x=3\times42=126 \end{gathered}[/tex]x =
