it is given that
y proportional to the x
[tex]y\text{ }\infty\text{ x}[/tex][tex]y=Cx[/tex]where C is the constant of proportionality
now
when x = 6 , y = 20
[tex]\begin{gathered} 20=C\times6 \\ C=\frac{20}{6} \end{gathered}[/tex]Now when x = 24
then y is
[tex]\begin{gathered} y=C\times24 \\ y=\frac{20}{6}\times24 \\ y=80 \end{gathered}[/tex]So the value of y is 80 when x = 24.
the correct answer is option b.
