Missing Number (SSC CPO 2023 Tier -1)

(Third number × 3) + First number = Second number

(5, 14, 3) → {(3 × 3) + 5} ⇒ 9 + 5 → 14

(3, 24, 7) → {(7 × 3) + 3} ⇒ 21 + 3 → 24

Similarly,
(9, 30, ?) → {(7 × 3) + 9} ⇒ 21 + 9 → 30

(Third number ÷ Second number) = First number

(2, 2, 4) → (4 ÷ 2) = 2

(1, 6, 6) → (6 ÷ 6) = 1

Similarly,

(7, 2, 14) → (14 ÷ 2) = 7

{Second number + (First number ÷ 2)} = Third number

(6, 8, 11) → {8 + (6 ÷ 2)} ⇒ 8 + 3 = 11

(2, 1, 2) → {1 + (2 ÷ 2)} ⇒ 1 + 1 = 2

Similarly,

(6, 7, ?) → {7 + (6 ÷ 2)} ⇒ 7 + 3 = 10