Astronauts flying in space on the Shenzhou spacecraft consume 0.9 kg of oxygen per person per day. How many kilograms of oxygen will be consumed by 3 astronauts flying in space for 5 days?
宇航员乘神州飞船在太空飞行，每人每天要消耗0.9千克氧气．3位宇航员在太空飞行5天，一共要消耗多少千克的氧气．
<gadget id="calculator">0.9 * 3 * 5</gadget>
<output>13.5</output>

<result>13.5</result>