Mix cement, yellow sand, and stones into concrete at a ratio of 2:3:5. Now there are 24 tons of yellow sand. How many tons of cement are needed?
把水泥、黄沙、石子按2：3：5配制成混凝土，现在黄沙有24吨，水泥需要多少吨．
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>