The price of a sporting goods has dropped from 45 yuan to 30 yuan now. How many pieces can you buy now for the price of 50 pieces? (Solve with ratio)
一种体育用品每个的售价由原来的45元降到现在的30元，原来买50个的钱，现在可以买多少个？(用比例解)
<gadget id="calculator">45 * 50</gadget>
<output>2_250</output>

<gadget id="calculator">2_250 / 30</gadget>
<output>75</output>

<result>75</result>