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1-73.

If $18$ inches is equal to $1\frac{1}{2}$ feet, how many feet is a $36$-inch board? A $72$-inch board? A $144$-inch board? Homework Help ✎

First, you can figure out the relationship between $18$ and $36$, then $18$ and $72$, then $18$ and $144$. With this information, it will be easier to solve for number of feet. Or, you can find the number of inches in one foot first.

$36$ is $2$ times $18$. To find how many feet $36$ inches is, you would need to multiple $1.5$ by $2$, since $1.5$ is equal to $18$ inches. Use this information to help you with the rest of the problem.