The school has prepared 400 yuan to buy green plants to beautify the campus. The unit price of each potted flower is 15 yuan. If you buy 4 pots of flowers at a time, you only need to pay 50 yuan. How many potted flowers can the school buy at most?
学校准备了400元购买绿色植物美化校园，每盆花的单价是15元，如果一次买4盆花只需付50元，学校最多可买多少盆花？
<gadget id="calculator">50 / 4</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">400 / (25/2)</gadget>
<output>32</output>

<result>32</result>