There are two two-digit numbers, A and B. If 1/4 of the number A is equal to 4/5 of the number B, what is the maximum difference between the two numbers A and B?
有A、B两个两位数，数，A数的1/4等于B数的4/5，那么A、B两个数的差最大是多少．
<gadget id="calculator">6 * 16</gadget>
<output>96</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">96 - 30</gadget>
<output>66</output>

<result>66</result>