Xiao Pang bought a coat, a pair of trousers and a pair of leather shoes for 700 yuan. Xiaoya asked him the price of each item, and Xiaopang told him: the coat is 340 yuan more expensive than the trousers, and the coat is 180 yuan more expensive than the sum of the shoes and trousers. What is the price of the trousers?
小胖用700元买了一件大衣、一条裤子和一双皮鞋．小亚问他每件商品的价格，小胖告诉他：大衣比裤子贵340元，大衣比鞋子和裤子的总和还贵180元，裤子的价格是多少元．
<gadget id="calculator">700 - 340 - 340</gadget>
<output>20</output>

<gadget id="calculator">180 + 20</gadget>
<output>200</output>

<gadget id="calculator">1 - 1</gadget>
<output>0</output>

<gadget id="calculator">1 + 1 + 0</gadget>
<output>2</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>