A landscaping company mixes its own proprietary blend of topsoil that costs \( \$ 29.15 \) per to to make. The blend contains soil that costs \( \$ 27.65 \) per ton and organic compost that costs
\( \$ 42.65 \) per ton. If the company already has \( 18 \) tons of soil on hand, how many tons of compost do they need to mix in?
\(27.65: 16.2\\42.65: 1.8\)
How long will it take \(\$ 1500\) to double itself at \(6 \%\) sim- ple interest?
A pharmacist makes eye drops with saline solution. A \(10 \%\) saline solution mixed with an \(80 \%\) saline solution makes \(7\) cups of a \(60 \%\) saline solution. How many cups of the \(80 \%\) solution should be used?
