When Lin Lin calculated □-5*4, he did the subtraction first and then the multiplication. The result he got was 80. What should be the correct result?
林林在计算□-5*4时，先算减法，后算乘法，得到的结果是80，正确结果应该是多少．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<result>5</result>