A cuboid brick, the ratio of length to width is 2:1, the ratio of width to height is 2:1, the total length, width and height are 35 cm, what is the volume of this brick?
一块长方体砖，长与宽的比是2：1，宽与高的比是2：1，长、宽、高共35厘米，这块砖的体积是多少．
<gadget id="calculator">4 + 2 + 1</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">35 * (4/7)</gadget>
<output>20</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">35 * (2/7)</gadget>
<output>10</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">35 * (1/7)</gadget>
<output>5</output>

<gadget id="calculator">20 * 10 * 5</gadget>
<output>1_000</output>

<result>1_000</result>