Discussion

Evaluate :

17.5 × 3 - 21 ÷ 7 - 3 × 12.5

Answer: B

The value is 12.

By the order of operations, multiplication and division are done before subtraction:

\[ \begin{aligned} &17.5 \times 3 - 21 \div 7 - 3 \times 12.5 \\ &= 52.5 - 3 - 37.5 = 12 \end{aligned} \]

The option 52.5 is just the first product. Working strictly from left to right, ignoring the order of operations, gives a different, wrong value.

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