There are 15 bags of soybeans in the tofu shop, each bag has 50 kg. 1 kg of soybeans can make 4 kg of tofu. How many kilograms of tofu can be made from these soybeans?
豆腐店有15袋黄豆，每袋有50千克．1千克黄豆能做4千克豆腐．这些黄豆能做多少千克豆腐？
<gadget id="calculator">50 * 15</gadget>
<output>750</output>

<gadget id="calculator">4 * 750</gadget>
<output>3_000</output>

<result>3_000</result>