There are two kinds of glass balls, red and yellow, in the box. The number of red balls is 2/5 of the number of yellow balls. If you take out 4 red balls and 7 yellow balls each time, after several times, there are still 2 red balls in the box. Balls, 50 yellow balls, how many glass balls are there in the box?
盒子里有红、黄两种玻璃球，红球为黄球个数的(2/5)，如果每次取出4个红球，7个黄球，若干次后，盒子里还剩2个红球，50个黄球，那么盒子里原有多少个玻璃球？
<gadget id="calculator">4 + 7</gadget>
<output>11</output>

<gadget id="calculator">50 - 5</gadget>
<output>45</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 7</gadget>
<output>3</output>

<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">11 * 15</gadget>
<output>165</output>

<gadget id="calculator">165 + 2 + 50</gadget>
<output>217</output>

<result>217</result>