Answer
52.5 lb pesticide
Work Step by Step
Create a proportion using ratios of pesticide: water.
$\frac{3\ lb}{20\ gal}=\frac{x\ lb}{350\ gal}$
Set the product of the means equal to the product of the extremes and solve for the variable.
$20\times x = 3\times350$
$20x=1050$
$20x\div20=1050\div20$
$x=52.5$
