The ratio of waste batteries collected by the first class and the second class is 5:3. If the second class collects 14 more waste batteries, it will be as much as the first class. How many waste batteries did the second shift collect?
一班和二班收集废电池的数量比是5：3，二班如果再收集14节废电池，就和一班收集的同样多．二班原来收集了多少节废电池？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>