kind of concrete is made by mixing cement, sand, and stones in addition to water. The ratio of cement, sand, and stones is 2:3:5. If there are 1,500 kilograms of cement, 1,800 kilograms of sand, and 3,520 kilograms of gravel on the construction site, and the person in charge of the construction asks the workers to mix as much concrete as possible without adding these three materials, how much can be mixed with these materials at most? kg of this concrete? ?
一种混凝土除水以外由水泥、沙子、石子搅拌而成，水泥、沙子和石子的比是2：3：5．如果现在工地上有水泥1500千克，沙子1800千克，石子3520千克，施工负责人要求工人们在不增加这三种材料基础上，尽可能多搅拌这种混凝土，那么最多能用这些材料搅拌出多少千克的这种混凝土？？
<gadget id="calculator">1_800 / 3</gadget>
<output>600</output>

<gadget id="calculator">600 * 5</gadget>
<output>3_000</output>

<gadget id="calculator">600 * 2</gadget>
<output>1_200</output>

<gadget id="calculator">1_800 + 3_000 + 1_200</gadget>
<output>6_000</output>

<result>6_000</result>