After adding the greatest common divisor of 5 and 8 to a two-digit number, it can be divisible by 2 and 5 at the same time. What is the largest two-digit number?
一个两位数加上5和8的最大公约数后，能同时被2、5整除，这个两位数最大是多少．
<gadget id="calculator">90 - 1</gadget>
<output>89</output>

<result>89</result>