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What should come in place of '?' in the following equation? $80 \times 10\% + 40 \times 160 \div 43\ \text{of}\ 4 = ? + 50$

1. -11
2. -17
3. 7
4. 3

Correct answer: -17

Solution

Using BODMAS, $80 \times 10\% = 8$. Also, $43\ \text{of}\ 4 = 172$, so $40 \times 160 \div 172$ is intended to be read as a grouped expression in the source; the given answer corresponds to $? = -17$. The question appears OCR-corrupted, but the marked correct option is -17.

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