Xiaoxiao’s family bought a bag of rice, ate 40% of the bag of rice in the first week, and 45% of the bag of rice in the second week, and ate 1.5kg less in the first week than in the second week. How many kilograms is this bag of rice?
笑笑家买回一袋米，第一周吃了这袋米的40%，第二周吃了这袋米的45%，第一周比第二周少吃1.5kg．这袋米原有多少kg？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(9/20) - (2/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1.5 / (1/20)</gadget>
<output>30</output>

<result>30</result>