My mother's original weight was 58 kg. After a month of exercise, she lost 3 kg. How many kilograms does mother weigh now?
妈妈原来的体重是58千克，经过一个月的锻炼，减轻了3千克．妈妈现在的体重是多少千克？
<gadget id="calculator">58 - 3</gadget>
<output>55</output>

<result>55</result>