If three cubes with side lengths of 5 cm are arranged in a row, what is the surface area?
把3个棱长5cm的正方体排成一行，它的表面积是多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">75 + 75 + 25</gadget>
<output>175</output>

<gadget id="calculator">175 * 2</gadget>
<output>350</output>

<result>350</result>