By interchanging the given two numbers (not digits) which of the following equation will NOT be correct? 3 and 5
I. 2 × 5 + 3 - 8 ÷ 2 = 7
II. 7 × 5 + 3 - 9 ÷ 1 = 15
Show answer & explanation
Correct answer: B
Explanation
Interchanging 3 and 5
I) 2 × 5 + 3 − 8 ÷ 2 = 7
2 × 3 + 5 − 8 ÷ 2 = 7
2 × 3 + 5 − 4 = 7
6 + 5 − 4 = 7
11− 4 = 7
7 = 7
The equation is correct
II) 7 × 5 + 3 − 9 ÷ 1 = 15
7 × 3 + 5 − 9 ÷ 1
2 1 + 5 − 9 = 17
17 ≠ 15
The equation is incorrect
Correct answer = Only II