My mother bought a watermelon weighing 10 kilograms with a water content of 99%. After a while, the water content of the watermelon will be 98%. How much does the watermelon weigh now?
妈妈买回来一个重10千克，含水量99%的西瓜，过了一段时间以后，西瓜的含水量将为98%，现在西瓜重多少千克？
<gadget id="calculator">99 / 100</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">1 - (99/100)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1 - (49/50)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/100) / (1/50)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 * (1/2)</gadget>
<output>5</output>

<result>5</result>