Mom spent 900 yuan to buy a parallelogram marble with a base of 2.5 meters and a height of 1.8 meters. Do you know how much this marble is per square meter?
妈妈花900元买了一块底2.5米，高1.8米平行四边形的大理石，你知道这块大理石每平方米多少元？
<gadget id="calculator">2.5 * 1.8</gadget>
<output>4.5</output>

<gadget id="calculator">900 / 4.5</gadget>
<output>200</output>

<result>200</result>