Brain teasers and puzzles
Questions collection
"Find the missing number"
By Panos Kalliantasis
PUZZLE 63
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Puzzle 54
Correct answer =40
First row 8^2-6^2=64-36=28
Second row 5^2-2^2=25-4=21
Third row 7^2-3^2=49-9=40
Puzzle 55
Correct answer is 12
First row least common multiple LCM (6,8)=24
Second row least common multiple LCM (3,4)=12
Third row least common multiple LCM(6,4)=12
Puzzle 56
Correct answer is 49
First row 4=2^2 16=4^2 (2+4)^2=36
Second row 9=3^2 25=5^2 (3+5)^2=64
Third row 16=4^2 9=3^2 (4+3)^2=49
Number series for competitive exams Can you complete the following number series?