If + means - , - means × , × means ÷ , ÷ means +, then what will come in place of the question mark (?) in the following equation? 56 - 3 ÷ 19 + 81 × 9 = ?
178
Swap each operator using the given code: - becomes ×, ÷ becomes +, + becomes -, and × becomes ÷.
The expression 56 - 3 ÷ 19 + 81 × 9 therefore becomes 56 × 3 + 19 - 81 ÷ 9.
Apply BODMAS: 56 × 3 = 168 and 81 ÷ 9 = 9.
Substitute back: 168 + 19 - 9 = 187 - 9 = 178.
Hence, the value in place of the question mark is 178.
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