The ratio of stamps between Xiaoming and Xiaohong is 5:6. After Xiaoming gives 10 pieces of Xiaohong, the ratio of the number of Xiaoming and Xiaohong is 4:5. How many stamps are there for Xiaoming and Xiaohong?
小明、小红的邮票比为5：6，小明给10张小红后，小明和小红张数的比是4：5，小明、小红共有邮票多少张？
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/11) - (4/9)</gadget>
<output>1/99 = around 0.010101</output>

<gadget id="calculator">10 / (1/99)</gadget>
<output>990</output>

<result>990</result>