Sports used to have 2 basketballs, 4 volleyballs, and 5 footballs, and bought 3 more basketballs. What percentage of these three balls are basketballs and volleyballs now?
体育原有2个篮球、4个排球、5个足球，又买来了3个篮球，现在篮球和排球占这三种球的几分之几？
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">2 + 4 + 5 + 3</gadget>
<output>14</output>

<gadget id="calculator">9 / 14</gadget>
<output>9/14 = around 0.642857</output>

<result>9/14 = around 0.642857</result>