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What will come in the place of '?' in the following equation, if '+' and '-' are interchanged and '├Ч' and '├╖' are interchanged? 35├Ч7+2├╖6тИТ13=?
7
6
4
9
6
Rewrite the equation immediately by substituting the symbols before calculating, then apply BODMAS (Brackets, Orders, Division, Multiplication, Addition, Subtraction) to avoid order-of-operation errors.
Rewrite the equation immediately by substituting the symbols before calculating, then apply BODMAS (Brackets, Orders, Division, Multiplication, Addition, Subtraction) to avoid order-of-operation errors.
Substitute Symbols
Given: '+' and '-' are interchanged, and 'x' and '├╖' are interchanged. The equation 35 x 7 + 2 ├╖ 6 - 13 becomes 35 ├╖ 7 - 2 x 6 + 13.
Solve using BODMAS
First, perform division and multiplication: (35 ├╖ 7) - (2 x 6) + 13 = 5 - 12 + 13.
Final Calculation
Perform addition and subtraction: 5 - 12 + 13 = -7 + 13 = 6.
A: 4 is incorrect because it results from incorrect order or operator misapplication; C: 9 is incorrect based on basic arithmetic error; D: 7 is incorrect as it ignores the BODMAS structure.
B is correct because replacing the operators and applying BODMAS (35 / 7 - 2 * 6 + 13) yields 5 - 12 + 13 = 6.
In competitive exams, always write down the new equation first after substitution to avoid mentally mixing up symbols, as these questions are designed to test your attention to detail under time pressure.
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