Pingping is 120cm taller, Qingqing is 10cm taller than Pingping, and the average height of Honghong and Qingqing is 20cm taller than Pingping. How tall is Honghong in centimeters?
平平身高120厘米，青青比平平高10厘米，红红与青青的平均身高比平平高20厘米．红红身高多少厘米．
<gadget id="calculator">120 + 20</gadget>
<output>140</output>

<gadget id="calculator">140 * 2</gadget>
<output>280</output>

<gadget id="calculator">120 + 10</gadget>
<output>130</output>

<gadget id="calculator">280 - 130</gadget>
<output>150</output>

<result>150</result>