其它
How many two-digit numbers can be divided by both 2 and 3 at the same time. 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples
*and* = 2 x 3 = 6  Multiple of 6 with 2 digits = 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, 96. 