A cuboid fish tank with a length of 80 cm, a width of 45 cm, and a height of 40 cm is filled with 26 cm deep water, and a piece of water with a length of 65 cm. After an iron block with a width of 20 cm is completely submerged in water, the water depth in the fish tank is 39 cm. What is the height of the iron block in centimeters?
一个长80cm、宽45cm、高40cm的长方体鱼缸，里面装有26cm深的水，把一块长65cm．宽20cm的铁块完全浸入水中后，鱼缸内的水深39cm，铁块的高是多少厘米？
<gadget id="calculator">39 - 26</gadget>
<output>13</output>

<gadget id="calculator">65 * 20</gadget>
<output>1_300</output>

<gadget id="calculator">13 / 1_300</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">80 * 45 * (1/100)</gadget>
<output>36</output>

<result>36</result>