24 15 3 d 6 15 If 'd' is the resultant of the first row, what will be the resultant of the second row?

Rules
(i) (odd number) + (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 24   15   3 ⇒ 24 + 15 = 39       [rule (ii)]
⇒     39 ÷ 3 = 13     [rule (iv)]
          = d
2nd Row d   6   15 ⇒ 13   6   15
⇒         13 - 6 = 7   [rule (v)]
⇒       7 + 15 = 22     [rule (i)]
∴ Resultant of second row = 22