The farmer's uncle sows wheat and needs 135 kilograms of wheat seeds per hectare. How many kilograms of wheat are needed to plant a rectangular wheat field with a length of 200 meters and a width of 150 meters?
农民伯伯播种小麦，每公顷需要小麦种135千克．种一块长200米、宽150米的长方形麦地，需要麦种多少千克？
<gadget id="calculator">150 / 10_000</gadget>
<output>3/200 = around 0.015</output>

<gadget id="calculator">200 * (3/200) * 135</gadget>
<output>405</output>

<result>405</result>