The largest rat in the world is produced in South America, with a weight of up to 50kg and a length of 1.5m. The world's smallest rat lives in the tropical rainforest of Thailand, with a weight of about 0.002kg and a length of 0.03m. Please ask two mathematical problems and try to solve them.
世界上最大的鼠产于南美洲，体重可达50kg，身长1.5m．世界上最小的鼠生活在泰国的热带雨林中，体重约0.002kg，身长0.03m．请你提出两个数学问题，并尝试解答．
<gadget id="calculator">1.5 - 0.03</gadget>
<output>1.47</output>

<result>1.47</result>