railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) Logical Reasoning Puzzle Logical Puzzle
Which two numbers should be interchanged to make the given equation correct?
21 × 4 + (84 ÷ 7) × 2 – 15 × 5 + 42 = 105
(Note: Interchange should be done of entire number and not individual digits of a given number.)
1
4 and 2
2
84 and 42
3
4 and 5
4
7 and 21