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If 'A' stands for '+', 'B' stands for '-', 'C' stands for '÷' and 'D' stands for '×', what will come in place of the question mark '?' in the following equation? 18 C 6 D 18 A 6 B 18=?
62
7
42
67
42
Follow BODMAS (Bracket, Of, Division, Multiplication, Addition, Subtraction) strictly. Replace letters with symbols: C=÷, D=×, A=+, B=-.
Follow BODMAS (Bracket, Of, Division, Multiplication, Addition, Subtraction) strictly. Replace letters with symbols: C=÷, D=×, A=+, B=-.
Symbol Replacement
Substitute the given letters with their mathematical equivalents: 18 ÷ 6 × 18 + 6 - 18.
BODMAS Application
Apply BODMAS rule: First divide 18 by 6 to get 3. Then multiply 3 by 18 to get 54. Then add 6 to 54 to get 60. Finally, subtract 18 from 60 to get 42.
A: 62 is incorrect. B: 7 is incorrect. D: 67 is incorrect.
C is correct because the expression 18 ÷ 6 × 18 + 6 - 18 simplifies to 3 × 18 + 6 - 18, which is 54 + 6 - 18, resulting in 42.
Always ensure you perform division and multiplication from left to right if they appear consecutively before moving to addition and subtraction.
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