68. 5536-!-item-!-187;#058&004638
What is the tens digit of the positive integer r ?
(1) The tens digit of r/10 is 3.
(2) The hundreds digit of 10r is 6.
Ans. B
有找了一下相關的題型,但還是無法解出這題~
自己算的是
(1) r/10 = x.x3 --> r = x.3x not sufficient
(2) 10r = x.xx6 --> r = x.xxx6 not sufficient
想好久還是想不出來,有人可以幫忙嗎?