SSE JE Electrical Engineering 24 March 2021 Shift 1 Paper

The logic follows here is;
In 30 ∶ 56;
30 = 5 × 6
(5 + 2) × (6 + 2) = 7 × 8 = 56
Similarly;
20 = 4 × 5
(4 + 2) × (5 + 2) = 6 × 7 = 42
Hence, "42" is the correct answer.