How many square centimeters of glass is needed for Xiao Ming's father to make an uncovered glass fish tank with a length of 30 cm, a width of 15 cm, and a height of 25 cm?
小明的爸爸要做一个长30厘米，宽15厘米，高25厘米的无盖玻璃鱼缸，需要多少平方厘米的玻璃？
<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<gadget id="calculator">15 * 25</gadget>
<output>375</output>

<gadget id="calculator">750 + 375</gadget>
<output>1_125</output>

<gadget id="calculator">1_125 * 2</gadget>
<output>2_250</output>

<gadget id="calculator">450 + 2_250</gadget>
<output>2_700</output>

<result>2_700</result>