Paper 1 · Mathematical Reasoning and Aptitude
Find the odd number pair: 80 : 9, 64 : 8, 36 : 6, 7 : 49.
A80 : 9 ✓ Correct
B64 : 8
C36 : 6
D7 : 49
Correct answer: (A) 80 : 9 — 80 : 9 is the odd pair, so that is the answer.
Explanation
★80 : 9 is the odd pair, so that is the answer.
★In each pair one number is the square of the other.
★64 is 8 squared, 36 is 6 squared and 49 is 7 squared.
★So those three pairs join a number with its square.
★9 squared is 81, not 80, so 80 : 9 breaks the rule.
★So the odd pair is 80 : 9.
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