Xiaoming has 2100 yuan in lucky money this year, which is less than Xiaohua (3/10). How much money does Xiaohua have this year?
小明今年有2100元压岁钱，比小华少(3/10)，小华今年有压岁钱多少元？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2_100 / (7/10)</gadget>
<output>3_000</output>

<result>3_000</result>