Hard
Interchanging the signs '+' and '-' and numbers 5 and 8, which one is correct?
Explanation
Explanation
Taking option C's equation '82-35+55=2' and swapping every 5 with 8 (and vice versa) along with swapping + and - signs gives '52+38-88=2'. Checking: 52+38=90, 90-88=2, which is true. None of the other options remain valid after the same swap is applied.
PRO TIP
Re-check your working by substituting the answer back into the original question.