There is a bag of rice, half of which is taken out for the first time is more than 1.5kg, half of the remaining rice is taken out for the second time and less than 2kg, and the rice in the last bag is 20kg. How many kilograms of rice is in this bag?
有一袋大米，第一次取出全部的一半多1.5kg，第二次取出余下大米的一半少2kg，最后袋中的大米还剩20kg，这袋大米原来有多少千克？
<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 + 1.5</gadget>
<output>37.5</output>

<gadget id="calculator">37.5 * 2</gadget>
<output>75</output>

<result>75</result>