18, 20, 23, 32, 48, 73, 109

The series is 18 +12 = 19; 19 + 22 = 23; 23 + 32 = 32; 32 + 42 = 48; 48 + 52 = 73 + 62 = 109

Correct Answer: 20

Explanation:

The series is 18 +1² = 19; 19 + 2² = 23; 23 + 3² = 32;
32 + 4² = 48; 48 + 5² = 73 + 6² = 109

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