Uncle Wang raised a batch of small rabbits, among which there were 350 small white rabbits, which accounted for 70% of the small rabbits, and the rest were small gray rabbits. How many small rabbits were there in this batch?
王大伯养了一批小兔，其中小白兔有350只，正好占这批小兔的七成，其余的都是小灰兔，这批小兔共有多少只？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">350 / (7/10)</gadget>
<output>500</output>

<result>500</result>