If 1 + 2 = 5 and 3 + 4 = 12 , then 10 + 13 = ?

If 5 = 5 , 10 = 55 , 15 = 610 then 20 = ?

If a = true , b = false , c = true then (a and b and c) = ?

false

(On the grounds that you can't derive a true statement by "anding" a set of false ones, or a set containing a false one) ??

Well Alan, I have absoutely no idea what this question is about so I'll give you thumbs up for providing A answer.