← Back to Quizzes Hints: 2/2 Brain Teaser Set – 8 Medium Start Your name (optional): Share Certificate Browse Quizzes Play Again [{"type":"single","prompt":"Find the missing term: 7, 14, 28, 56, ?","options":["84","100","112","120"],"answer":[2],"explanation":"\u00d72 pattern \u2192 56\u00d72=112.","hint":"Multiply by 2."},{"type":"single","prompt":"Which is different?","options":["Table","Chair","Sofa","Door"],"answer":[3],"explanation":"Door is not furniture to sit on.","hint":"Functional difference."},{"type":"single","prompt":"If CODE = 27 and WORD = 60, find DATA.","options":["36","38","40","42"],"answer":[2],"explanation":"Sum of positions \u00f7 vowel count \u2248 40.","hint":"Sum\/vowel ratio."},{"type":"single","prompt":"Statements: All pens are blue. No blue is red.","options":["Only 1 follows","Only 2 follows","Both follow","Neither"],"answer":[0],"explanation":"All pens are blue and blue\u2260red \u21d2 no pen is red.","hint":"Direct negation."},{"type":"single","prompt":"Series: 1, 3, 6, 10, 15, ?","options":["18","20","21","24"],"answer":[2],"explanation":"Triangular numbers \u2192 +2,+3,+4,+5,+6.","hint":"n(n+1)\/2 formula."},{"type":"single","prompt":"If 4^x = 64, find x.","options":["2","3","4","5"],"answer":[1],"explanation":"4\u00b3 = 64 \u2192 x=3.","hint":"Exponent pattern."},{"type":"single","prompt":"A train 120 m long passes a pole in 6 sec. Find speed.","options":["60 km\/h","72 km\/h","75 km\/h","80 km\/h"],"answer":[1],"explanation":"Speed = 120\/6=20 m\/s \u2192 20\u00d73.6=72 km\/h.","hint":"Convert m\/s\u2192km\/h."},{"type":"single","prompt":"If a # b = a\u00b2 + b\u00b2, find 5 # 12.","options":["144","149","154","169"],"answer":[3],"explanation":"25 + 144 = 169.","hint":"Pythagoras-type."},{"type":"single","prompt":"If 15% of x = 60, find x.","options":["300","350","400","450"],"answer":[2],"explanation":"x = 60\u00d7100\/15 = 400.","hint":"Percentage formula."},{"type":"single","prompt":"Average of first five even numbers.","options":["4","5","6","7"],"answer":[2],"explanation":"(2+4+6+8+10)\/5=30\/5=6.","hint":"Arithmetic mean."}]
