Guangming Primary School planted 80 trees in the third grade, twice as many trees in the fourth grade, and 12 more trees in the fifth grade than in the fourth grade. How many trees does fifth grade plant?
光明小学三年级种树80棵，四年级种的棵数是三年级的2倍，五年级种的比四年级多12棵．五年级种树多少棵？
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">160 + 12</gadget>
<output>172</output>

<result>172</result>