(100+○*4)/5 The result of this formula is equal to 32, so what is ○ equal to
(100+○*4)/5这道算式的结果等于32，那么○等于多少
<gadget id="calculator">32 * 5</gadget>
<output>160</output>

<gadget id="calculator">160 - 100</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>