Which two numbers should be interchanged to make the given equation correct?
25-28 + 21 × 10÷ 5= 43

Correct option is B

Given:
25-28 + 21 × 10÷ 5= 43
Option (a): Interchange 5 and 28 after interchanging the digit we get following equation -
25−5+21×10÷28 = 43
25−5+7.56 = 43
25−5+7.56 = 43
32. 56 – 5 = 43
27.55 ≠ 43Option (b): Interchange 21 and 25 after interchanging the digit we get following equation - 21−28+25×10÷5 = 43
21−28+25×2 = 43
21−28+50 = 43
71 – 28 = 43
43 = 43
Thus, the correct answer is (b) 21 and 25