Three steel balls of a certain type weigh 225g. Now there are a batch of balls of this type weighing 945g in total. How many balls are there in total?
某种型号的钢滚珠，3个重225g，现在有一批这种型号的滚珠，共重945g，一共有多少个滚珠？
<gadget id="calculator">225 / 3</gadget>
<output>75</output>

<gadget id="calculator">975 / 75</gadget>
<output>13</output>

<result>13</result>