One kind of concrete is made by mixing cement, sand, and stones at a ratio of 2:3:5. How many tons of cement are needed to prepare 1920 tons of this concrete?
一种混凝土是由水泥、沙子、石子按2：3：5配制而成的，现在配制1920吨这种混凝土，需要水泥多少吨？
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1_920 * (1/5)</gadget>
<output>384</output>

<result>384</result>