By interchanging the given two signs, which of the following equations will NOT be correct?
+ and
I. 27 3 - 18 3 + 9 = 24
II. 12 + 8 12 16 - 7 = 19
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Only II.
I. 27 3 - 18 3 + 9 = 24
By interchanging the given two signs (+ and ),
27 + 3 - 18 3 9 = 24
27 + 3 - 6 = 24
30 - 6 = 24
24 = 24 (Correct)
II. 12 + 8 12 16 - 7 = 19
By interchanging the given two signs (+ and ),
12 8 12 + 16 - 7 = 19
8 + 16 - 7 = 19
24 - 7 = 19
17 = 19 (Incorrect)