There are balls of three colors in a box, the ratio of the number of yellow balls to the number of red balls is 2:3, and the ratio of the number of red balls to the number of white balls is 4:5. Given 8 yellow balls, how many white balls are there?
盒子里有三种颜色的球，黄球个数与红球个数的比是2：3，红球个数与白球个数的比是4：5．已知黄球8个，白球有多少个？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">12 * (5/4)</gadget>
<output>15</output>

<result>15</result>