A cuboid block of wood has a surface area of 90 square centimeters. If it is sawed into two pieces, two identical cube blocks can be obtained. Find the surface area of a cube.
一块长方体的木块，表面积是90平方厘米，把它锯成两段，可以得到两个完全一样的正方体木块，求一个正方体的表面积．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">90 / 10</gadget>
<output>9</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>