The sum of the upper and lower bases of an isosceles trapezoid is 64cm, which is 4 times the sum of the two waists. What is the perimeter of the trapezoid?
一个等腰梯形的上、下底之和为64cm，是两腰之和的4倍，这个梯形的周长是多少．
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<gadget id="calculator">64 + 16</gadget>
<output>80</output>

<result>80</result>