A batch of mushrooms has a moisture content of 95%. After drying for one day, the weight decreases by 50 kg, and the moisture content drops to 90%. How many kg does this batch of mushrooms weigh?
一批蘑菇，含水率为95%，晾晒一天后，重量减少50千克，含水率降到90%，这批蘑菇原来有多少千克？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">50 * (9/10)</gadget>
<output>45</output>

<gadget id="calculator">50 - 45</gadget>
<output>5</output>

<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - 1 - (9/10)</gadget>
<output>-9/10 = around -0.9</output>

<gadget id="calculator">(19/20) + (-9/10)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 / (1/20)</gadget>
<output>100</output>

<result>100</result>