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What will come in place of the question mark (?) in the following equation if ‘+’ and ‘–’ are interchanged? 63 ÷ 9 – 14 × 11 + 28 = ?
129
138
133
135
133
Apply BODMAS strictly after swapping signs: first divide, then multiply, then add/subtract left to right.
Apply BODMAS strictly after swapping signs: first divide, then multiply, then add/subtract left to right.
Interchange signs
Given equation: 63 / 9 - 14 * 11 + 28. Interchanging + and - gives: 63 / 9 + 14 * 11 - 28.
Apply BODMAS rule
First, perform division: 63 / 9 = 7. Equation becomes: 7 + 14 * 11 - 28.
Perform multiplication
Next, perform multiplication: 14 * 11 = 154. Equation becomes: 7 + 154 - 28.
Final addition and subtraction
Addition: 7 + 154 = 161. Subtraction: 161 - 28 = 133.
A: 129 results from incorrect order of operations; B: 138 results from calculation error; D: 135 results from missing the division or multiplication steps.
C is correct because applying BODMAS to the transformed equation 63/9 + 14*11 - 28 yields 7 + 154 - 28 = 133.
Always verify sign interchange first; a common trap is to forget the order of operations after changing signs, leading to wrong intermediate values.
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