Divide the weight of the apple by 2 and add 10 to get the weight of the orange, which weighs 100 kg. How many kilograms does an apple weigh?
苹果的重量除以2，再加上10，就等于橘子的重量，橘子重100千克．苹果重多少千克？
<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<result>180</result>