The ratio given is 1 : 6
The equivalent is 7 : x
To calculate x;
[tex]\begin{gathered} 1\colon6=7\colon x \\ \frac{1}{6}=\frac{7}{x} \\ \text{Cross multiply and you have;} \\ x=6\times7 \\ x=42 \end{gathered}[/tex]The number that makes the ratio equivalent is therefore 42
