A bag of rice, after eating (1/4), add another 20 kg, then the rice in the bag is 15% more than the original rice. How many kilograms is this bag of rice originally?
一袋大米，吃去(1/4)后，再加进20千克，这时袋里的大米比原来大米多15%．这袋大米原有多少千克？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/20) - (3/4)</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">1 + (-3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<result>50</result>