Answer
$108\ in=9\ ft$
Work Step by Step
The lever priciple states that
$$F_1d_1=F_2d_2.$$
We plug in the given values to get:
$$
1800\times 9=150\times x\Longrightarrow x=\frac{1800\times 9}{150}=108\ in=9\ ft
.$$
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