The ratio of the number of stamps collected by Xiao Ming and Xiao Hong is 5:6. After Xiao Ming gives Xiao Hong 10 stamps, the ratio of the number of stamps collected by Xiao Ming and Xiao Hong is 4:5. How many stamps do Xiao Ming and Xiao Hong have altogether?
小明和小红所集邮票张数的比是5：6，小明给小红10张邮票后，小明和小红邮票张数的比是4：5．小明和小红一共有多少张邮票？
<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>