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3-98.

A seed mixture contains ryegrass and bluegrass. If $40\%$ of the mixture is ryegrass, what is the ratio of ryegrass to bluegrass?

If $40\%$ of the mixture is ryegrass, what is the percentage of bluegrass?

ryegrass = $40\%$, bluegrass =$60\%$

$\frac{\text{ryegrass}}{\text{bluegrass}}=\frac{40}{60}$

$\frac{40}{60}=\frac{4}{6}=\frac{2}{3}$