There are 10 red wooden blocks and 5 green wooden blocks in a box. If you draw a wooden block from it, what is the probability of drawing a green wooden block?
盒子里有10个红色木块和5个绿色木块，从中摸出一个木块，摸出绿色木块的可能性是多少．
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>