Answer :
We know that 6 concrete broks weigh 90 kilograms so we can fin hoy much weigh each brok like this:
[tex]\frac{90}{6}=15[/tex]Now we can complete the table with this factor so:
[tex]\begin{gathered} 1\to15 \\ 2\to30 \\ 3\to45 \\ 4\to60 \\ 5\to75 \\ 6\to90 \\ 7\to105 \end{gathered}[/tex]the constant of proportionality will be:
[tex]k=\frac{y}{x}=\frac{105}{7}=15[/tex]And the number next to the one will be 15 and that means that 1 brick weigh 15 kilograms