A basketball is 68 yuan, Mr. Zhang bought 3, if he brought 250 yuan, how much money is left?
一个篮球68元，张老师买了3个，如果他带了250元，还剩多少元？
<gadget id="calculator">68 * 3</gadget>
<output>204</output>

<gadget id="calculator">250 - 204</gadget>
<output>46</output>

<result>46</result>