The order of operations of 500/25-20 is subtraction first, then division. What should be the formula?
500/25-20的运算顺序为先减法，再算除法，算式应该是多少．
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">500 / 5</gadget>
<output>100</output>

<result>100</result>