The six sides of a cube are painted black and white respectively. When it is thrown up, the probability that the black side is up is (1/2). How many sides of it are painted black.
一个正方体6个面分别涂成黑色和白色，当它被抛起后，黑面向上的可能性是(1/2)，它有多少个面被涂成了黑色．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

<result>3</result>