The ratio of degrees of an acute angle to a right angle is 2:3, what is the degree of the acute angle.
一个锐角与一个直角的度数比是2：3，这个锐角是多少度．
<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<result>60</result>