The ratio of the perimeters of squares A and B is 5:4, the perimeter of square A is 40 cm, find the perimeter of square B.
甲、乙两个正方形周长的比是5：4，甲正方形的周长是40厘米，求乙正方形的周长．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 * (4/5)</gadget>
<output>32</output>

<result>32</result>