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Problem-Solving By Substitution
Interchange Of Signs And Numbers

Using the symbols: '+' for addition, '-' for subtraction, '×' for multiplication, and '÷' for division, evaluate 10 + 5 × 2 - 3 ÷ 1.

Answer: A. 20
Following BODMAS: 5 × 2 = 10; 3 ÷ 1 = 3; 10 + 10 - 3 = 17.
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