There is a pile of red and yellow glass balls, among which the number of red balls is 1.5 times the number of yellow balls. If 5 red balls and 4 yellow balls are taken out from this pile of balls at the same time, how many times are taken out? There are 9 red balls left and 2 yellow balls left.
有红黄两种玻璃球一堆，其中红球个数是黄球个数的1.5倍，如果从这堆球中每次同时取出红球5个，黄球4个，那么取了多少次后红球剩9个，黄球剩2个．
<gadget id="calculator">2 * 1.5</gadget>
<output>3</output>

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">4 * 1.5</gadget>
<output>6</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<result>6</result>