345 23 X 45 17 81 It 'X' is the resultant of the second row, what is the resultant of the first row?

Rules
(i) (2-digit odd number) + (2-digit odd number)
(ii) 2-digit even number → 2-digit perfect square odd number then, (odd number) - (Even number)
(iii) (3-digit number) ÷ (2-digit number)
(iv) (Prime number) + (Even number)
(v) (Even number) x (Even number)
Solution:
2nd Row 45   17   81 ⇒ 45 + 17 = 62     [rule (i)]
⇒         81 - 62 = 19 [rule (ii)]
1st Row 345   23   X ⇒ 345   23   19
⇒ 345 ÷ 23 = 15 [rule (iii)]
⇒ 345 ÷ 15 + 19 [rule (i)]
∴ Resultant of first row = 34