By interchanging the given two signs, which of the following equation will be NOT correct?
+ and -
I. 18 ÷ 3 + 8 × 5 - 4 = 20
II. 6 + 8 × 9 ÷ 3 - 4 = 14
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Both I and II.
I. 18 ÷ 3 + 8 × 5 - 4 = 20
On interchanging the sign;
18 ÷ 3 - 8 × 5 + 4 = 20
6 - 40 + 4 = 20
10 - 40 = 20
-30 = 20
II. 6 + 8 × 9 ÷ 3 - 4 = 14
On interchanging the sign;
6 - 8 × 9 ÷ 3 + 4 = 14
6 - 24 + 4 = 14
10 - 24 = 14
-14 = 14