Question
Complete the analogy. 81 : 45 :: 72 :
?Solution
The sum of the digits of the 1st number is multiplied by 5 to obtain the 2nd number. 81 : 45 → (8+1) = 9,(9 × 5) = 45 Similarly, 72 : ? → (7 + 2) = 9,(9 × 5) = 45.
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