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Question:
The ratio of solute to solution is 1:5.
Write a proportion and solve.
Let the grams of solute should be used be "x", plug in the ratio above we have:
\( \frac{\mathrm{1} }{\mathrm{5} } = \frac{\mathrm{x} }{\mathrm{90} }\)
\(x = \frac{\mathrm{1} }{\mathrm{90} } = \frac{\mathrm{x} }{\mathrm{5} }\)
\(x = 18\)
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