By interchanging the given two numbers (not digits) which of the following equation will NOT be correct? 9 and 7
I. 9 × 2 + 7 − 6 ÷ 3 = 21
II. 7 × 3 + 9 − 8 ÷ 2 = 30
Show answer & explanation
Correct answer: D
Explanation
I. 9 × 2 + 7 − 6 ÷ 3 = 21
Substituting 9 and 7:
7 × 2 + 9 − 6 ÷ 3
Now BODMAS:
7 × 2 = 14
6 ÷ 3 = 2
14 + 9 − 2 = 21
This is correct.
II. 7 × 3 + 9 − 8 ÷ 2 = 30
Substituting 9 and 7:
9 × 3 + 7 − 8 ÷ 2
BODMAS:
9 × 3 = 27
8 ÷ 2 = 4
27 + 7 − 4 = 30
This is also correct.
Both equations are correct, so neither is wrong.
Correct answer: 4) Neither I nor II.