RT-Mart sells washing machines. The total (1/5) sold in the morning is 20 more, and the rest (1/2) sold in the afternoon is 20 less, so there are 100 left. How many washing machines did RT-Mart originally have?
大润发出售洗衣机，上午售出总数的(1/5)多20台，下午售出剩下的(1/2)少20台，结果还剩100台．大润发原来有洗衣机多少台？
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">80 / (1/2)</gadget>
<output>160</output>

<gadget id="calculator">160 + 20</gadget>
<output>180</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">180 / (4/5)</gadget>
<output>225</output>

<result>225</result>