Which two numbers should be interchanged to make the given equation correct?
81 + 31 ÷ 9 − 7 = 33
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 31 and 81
The given equation is: 81 + 31 ÷ 9 − 7 = 33
Checking each options one by one:
1. 9 and 7
81 + 31 ÷ 7 − 9 = 33
81 + 4.42 − 9 = 33
76.42 = 33
76.42 is not equal to 33.
2. 31 and 81
31 + 81 ÷ 9 − 7 = 33
31 + 9 − 7 = 33
33 = 33
33 is equal to 33.
The equation is balanced. No need to check other options.
Hence, option 2 is the correct option.