The school bought 170 red balloons, yellow balloons are 3 times more than red balloons, blue balloons are 68 more than yellow balloons, how many blue balloons are there?
学校买来170个红气球，黄气球是红气球的3倍，蓝气球比黄气球多68个，蓝气球有多少个？
<gadget id="calculator">170 * 3</gadget>
<output>510</output>

<gadget id="calculator">510 + 68</gadget>
<output>578</output>

<result>578</result>