The construction site transports 120 tons of cement, sand and stones each, and mixes concrete according to the ratio of 2:3:5. If the sand is just used up, how many tons of stones are there?
建筑工地运来水泥、沙子和石子各120吨，按2：3：5配制混凝土，如果沙子正好用完，那么石子差多少吨？
<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<gadget id="calculator">200 - 120</gadget>
<output>80</output>

<result>80</result>