There are two boxes of small balls, A and B. There are 40 red balls in A and 60 white balls in A. The ratio of red balls to white balls in B is 5:4. If they are put into the same box, then the ratio of red balls to white balls is 10% less, how many red balls are there in Box B?
有甲乙两盒小球，甲中红球有40个，白球有60个，乙中有红球与白球的比是5：4，若把它们都放入同一个盒子里，那么红球比白球少10%，原来乙盒有红球多少个？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">60 * (1/10)</gadget>
<output>6</output>

<gadget id="calculator">60 - 40 - 6</gadget>
<output>14</output>

<gadget id="calculator">4 * (1/10)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - 4</gadget>
<output>-18/5 = around -3.6</output>

<gadget id="calculator">5 + (-18/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">14 / (7/5)</gadget>
<output>10</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<result>50</result>