Brain Teaser: It Will Literally Crack Your Brain!
By Akinlabi Omo-Oso|2019-11-13T05:24:26+01:00October 26th, 2016|Categories: Quizzes & Fun|Tags: Brain, Brain Teaser, fun, quizzes, Sweat|6 Comments
Use our classwork notes and past questions to prepare and pass Waec, Jamb and Neco once.
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.