After my mother brought 30 yuan to the street to buy vegetables, there was 14.6 yuan left. How much did you spend on grocery shopping?
妈妈带了30元上街买菜后，还剩下14.6元．买菜用去了多少钱？
<gadget id="calculator">30 - 14.6</gadget>
<output>15.4</output>

<result>15.4</result>