The weeping willow is 6 meters high, the poplar is three times as high as the weeping willow, and the red cedar is 72 meters taller than the poplar. How tall is the redwood tree?
垂柳高6米，杨树的高度是垂柳的3倍，红杉树比杨树高72米．红杉树高多少米？
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 + 72</gadget>
<output>90</output>

<result>90</result>