Which two numbers should be interchanged to make the given equation correct?
(NOTE: Numbers must be interchanged and not the constituent digits e.g. if 2 and 3 are to be interchanged in the equation 43 × 3 + 4 ÷ 2, then interchanged equation is 43 × 2 + 4 ÷ 3)

15 × 5 − 75 + (300 ÷ 6) + 3 × 19 = 115 ​​

Correct option is B

Logic: Interchange the given numbers and solve as per BODMAS rule.
Option A,
Given:
15 × 5 − 75 + (300 ÷ 6) + 3 × 19 = 115
After changing:
6 × 5 − 75 + (300 ÷ 15) + 3 × 19 = 115
30 − 75 +20 + 57 = 115
32≠115
So its not correct.
Option B,
Given:
15 × 5 − 75 + (300 ÷ 6) + 3 × 19 = 115
After changing:
19 × 5 − 75 + (300 ÷ 6) + 3 × 15 = 115
95 − 75 + 50 + 45 = 115
115=115
So, its correct.
Option b matches perfectly. Hanse option b is correct answer.