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Solutions
Given equation is → 70 + 15 ÷ 80 × 3 - 100 = 370
After replacing the signs from left to right and using the BODMAS rule,

Option 1 → × and ÷
70 + 15 × 80 ÷ 3 - 100 = 370
70 + 15 × 26.66 - 100 = 370
70 + 399.9 - 100 = 370
469.9 - 100 = 370
369.9 = 370
369.9 approximately = 370
370 = 370
Option 2 → + and -
70 - 15 ÷ 80 × 3 + 100 = 370
70 - 0.875 × 3 + 100 = 370
70 - 2.625 + 100 = 370
170 - 2.625 = 370
167.375 ≠ 370
Option 3 → × and -
70 + 15 ÷ 80 - 3 × 100 = 370
70 + 0.875 - 3 × 100 = 370
70 + 0.875 - 300 = 370
70.875 - 300 = 370
-229.125 ≠ 370
Option 4 → + and ÷
70 ÷ 15 + 80 × 3 - 100 = 370
4.66 + 80 × 3 - 100 = 370
4.66 + 240 - 100 = 370
244.66 - 100 = 370
144.66 ≠ 370
Hence, the correct answer is "Option 1".