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Find the value of x.

$\frac{4}{x}=\frac{2}{5}$

Find the value of x.

$\frac{x+3}{2}=\frac{4}{3}$

Can you find the ratio of 2L to 4km? Explain.

Find the value of x.

$\frac{x+3}{2}=\frac{2x−1}{3}$

Find the measure of each angle.

The measures of the angles of a triangle are in the ratio$3:4:5$.

What is the ratio of the measure of an interior angle to the measure of an exterior angle in a regular hexagon? A regular decagon? A regular$n−$ gon?

Is the ratio$a:b$always, sometimes, or never equal to the ratio$b:a$? Explain.