The sum of 60% of x and 21 equals 33. (solution by equation)
x的60%与21的和等于33．(用方程解)
<gadget id="calculator">33 - 21</gadget>
<output>12</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">12 / (3/5)</gadget>
<output>20</output>

<result>20</result>