store sells 78 blue balloons, and sells 39 more red balloons than blue balloons, which is six times as many. How many red balloons are sold?
一个商店卖出出78个蓝气球，卖出的红气球是蓝气球的6倍还多39个，卖出的红气球多少个？
<gadget id="calculator">78 * 6</gadget>
<output>468</output>

<gadget id="calculator">468 + 39</gadget>
<output>507</output>

<result>507</result>