Question
The second number in the given number-pairs is obtained
by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs except one. Find that odd number-pair.Solution
The pattern followed here is as follows: (First number x 3) + 5 = Second number 15: 50 (15 x 3) + 5 = 45 + 5 = 50 19: 62 (19 x 3) + 5 = 57 + 5 = 62 11: 38 (11 x 3) + 5 = 33 + 5 = 38 21: 66 (21 x 3) + 5 = 63 + 5 = 68
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