philemon jonathan November 19, 2016 at 10:49 pm clue to all on the lhs is an AP with first term 10 and common difference 2 answer is 72 Reply
Akinlabi Omo-Oso November 21, 2016 at 9:37 am Nice try Jonathan, but the right answer is 90. (4 x 4) + 4 = 20; (5 x 5) + 5 = 30; (6 x 6) + 6 = 42; (7 x 7) + 7 = 56. Hence, (9 x 9) + 9 = 90. Reply
6 thoughts on “Brain Teaser: It Will Literally Crack Your Brain!”
72 is the answer
74
clue to all
on the lhs is an AP with first term 10 and common difference 2
answer is 72
Nice try Jonathan, but the right answer is 90. (4 x 4) + 4 = 20; (5 x 5) + 5 = 30; (6 x 6) + 6 = 42; (7 x 7) + 7 = 56. Hence, (9 x 9) + 9 = 90.
ans = 90
proof = (9*9) + 9
I AGREE WITH AKINLABI OMO-OSO.