Some 2 cents and 5 cents coins total 299 cents, the number of 2 cents is 4 times the number of 5 cents, how many 5 cents are there?
一些2分与5分的硬币共299分，其中2分的个数是5分个数的4倍，5分的有多少个．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">299 / 13</gadget>
<output>23</output>

<result>23</result>