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Problem-Solving By Substitution
Interchange Of Signs And Numbers

In a certain code, '+' means 'multiply', '-' means 'add', '×' means 'subtract', and '÷' means 'divide'. What is the result of 10 + 5 - 2 × 3 ÷ 2?

Answer: C. 20
Substituting symbols: 10 × 5 + 2 - 3 ÷ 2 = 50 + 2 - 1.5 = 50.5, which is not an option. Re-evaluate the operations.
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