Concept:Replace each operation symbol with its new meaning as given, then apply BODMAS rule to evaluate the expression.
Explanation:The symbols are swapped as follows: ÷ becomes ×, + becomes -, and × becomes ÷.
Thus, the given expression 20 + 4 ÷ 2 × 1 becomes 20 - 4 × 2 ÷ 1.
Now follow BODMAS. Multiplication and division have equal precedence, so solve left to right.
First, 4 × 2 = 8. Then, 8 ÷ 1 = 8. Finally, 20 - 8 = 12.
Answer:12, which is option A.
