Question : Directions: Four number pairs have been given, out of which three are alike in some manner and one is different. Select a different one.
NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
29 : 160
31 : 138
27 : 150
21 : 120
Option 1: 31 : 138
Option 2: 21 : 120
Option 3: 27 : 150
Option 4: 29 : 160
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Correct Answer: 31 : 138
Solution :
Let's check the options –
First option:
31 : 138→(31 + 3) × 5 = 34 × 5 = 170 ≠ 138
Second option:
21 : 120→(21 + 3) × 5 = 24 × 5 = 120
Third option:
27 : 150→(27 + 3) × 5 = 30 × 5 = 150
Fourth option:
29 : 160→(29 + 3) × 5 = 32 × 5 = 160
So, the first option differs from the other three options as the resultant is 170 instead of 138. Hence, the first option is correct.
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