It is known that 84/3=28, then (84*5)/(3*5)=how many.
已知84/3=28，那么(84*5)/(3*5)=多少．
<gadget id="calculator">84 * 5</gadget>
<output>420</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">420 / 15</gadget>
<output>28</output>

<result>28</result>