If ‘-‘ stands for ‘+’, ‘+’ stands for ‘x’, ‘x’ stands for ‘-‘, then which one of the following is not correct?

Question

If ‘-‘ stands for ‘+’, ‘+’ stands for ‘x’, ‘x’ stands for ‘-‘, then which one of the following is not correct?

A. 7 + 28 - 3 x 52 = 127

B. 33 x 5 - 10 + 20 = 228

C. 44 - 9 + 6 x 11 = 87

D. 22 + 7 - 3 x 9 = 148

Answer: A

Solution:

From option (A),

   LHS = 7 + 28 - 3 x 52 = 7 x 28 + 3 -52

   = 196 + 3 - 52 = 199 -52

   = 147 ≠ 127 (RHS)

From option (B),

   LHS = 33 x 5 - 10 + 20 = 33 -5 + 10 x 20

   = 33 - 5 + 200 = 233 - 5 

   = 228 = RHS

From option (C),

   LHS = 44 - 9 + 6 x 11 = 44 + 9 x 6 -11

   = 44 + 54 - 11 = 98 - 11 

   = 87 = RHS

From option (D),

   LHS = 22 + 7 - 3 x 9 = 22 x 7 + 3 - 9

   = 154 + 3 - 9 = 157 - 9 

   = 148 = RHS

Hence, equation in option (A) is not correct.