If a cube with side length 15 cm is sawn into a small cube with side length 5 cm, how much is the surface area increased after sawing?
将一个棱长15厘米的正方体木块锯成棱长5厘米的小正方体，锯完后表面积增加了多少？
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">15 / 125</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">15 * 15 * (3/25)</gadget>
<output>27</output>

<gadget id="calculator">5 * 5 * 6 * 27</gadget>
<output>4_050</output>

<gadget id="calculator">15 * 15 * 6</gadget>
<output>1_350</output>

<gadget id="calculator">4_050 - 1_350</gadget>
<output>2_700</output>

<result>2_700</result>