Three steel balls of a certain type weigh 22.5 grams. Now there are some balls of this type, weighing 945 grams in total, how many are there? (Answer with proportional knowledge)
某型号的钢滚珠3个重22.5克．现在有一些这种型号的滚珠，共重945克，一共有多少个？(用比例知识解答)
<gadget id="calculator">22.5 / 3</gadget>
<output>7.5</output>

<gadget id="calculator">945 / 7.5</gadget>
<output>126</output>

<result>126</result>