Two solid parts made of the same metal copper, one with a volume of 20 cubic centimeters and a mass of 156 grams, and the other with a volume of 45 cubic centimeters, what is the mass in grams?
用同样的金属铜制成的两个实心零件，一个体积是20立方厘米，质量是156克，另一个体积是45立方厘米，质量应该是多少克？
<gadget id="calculator">156 / 20</gadget>
<output>39/5 = around 7.8</output>

<gadget id="calculator">(39/5) * 45</gadget>
<output>351</output>

<result>351</result>