There are two piles of sand, A and B. Pile A has 200 tons, and Pile B has 160 tons. Use a truck with a load of 5 tons to transport the sand from Pile A to Pile B. After how many times, the two piles of sand weigh the same.
甲、乙两堆沙子，甲堆有200吨，乙堆有160吨，用一辆载重5吨的汽车把沙子从甲堆运到乙堆，运多少次后两堆沙子一样重．
<gadget id="calculator">200 + 160</gadget>
<output>360</output>

<gadget id="calculator">360 / 2</gadget>
<output>180</output>

<gadget id="calculator">200 - 180</gadget>
<output>20</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<result>4</result>