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Select the option that is related to the third number in the same way as the second number is related to the first number and the sixth number is related to the fifth number.

15 : 135 :: 16 : ? :: 18 : 189


1. 131
2. 121
3. 152
4. 141

1 Answer

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Best answer
Correct Answer - Option 3 : 152

Given: 15 : 135 :: 16 : ? :: 18 : 189

The logic follows here is:

15 : 135 → (15 + 3) × 15 ÷ 2 = 18 × 15 ÷ 2 = 9 × 15 = 135

18 : 189 → (18 + 3) × 18 ÷ 2 = 21 × 9 = 189

Similarly,

16 : ? → (16 + 3) × 16 ÷ 2 = 19 × 8 = 152

⇒ ? = 152

Hence, 152 is the correct answer.

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