Write numbers on each of the six faces of a cube so that the probability of "5" facing up after the cube is thrown is (1/2). Write "5" on how many faces the cube has.
在一个正方体的六个面上分别写上数字，使得正方体掷出后，"5"朝上的可能性为(1/2)．正方体有多少个面要写上"5"．
<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>