The two inner terms of a ratio are the reciprocals of each other, one outer term is the largest two-digit number that can be divisible by 2, 3, and 5, and the other outer term is what it is.
一个比例的两内项互为倒数，一个外项是一个能被2、3、5整除的最大两位数，另一个外项是多少．
<gadget id="calculator">1 / 90</gadget>
<output>1/90 = around 0.011111</output>

<result>1/90 = around 0.011111</result>