Boss Liu planned to sell a box of pears one by one. The price of each pear was the same. It was estimated that a box would cost 120 yuan, but 10 rotted, he could only sell it for 100 yuan. How many pears are there in this box?
刘老板打算把一箱梨按个卖，每个梨价钱一样，预计一箱可得120元，可是烂了10个，他只卖得了100元．这箱梨有多少个．
<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<result>60</result>