Identify relevant information, ignore distractors, and choose an appropriate operation or representation for a contextual problem.
Clean up a context into a useful model
Problem
Granola bars cost \(\$3~\text{per}~\text{box}\). Mia buys \(4~\text{boxes}\) and uses a \(\$2\) coupon; other store details are irrelevant. Write and evaluate an equation for cost \(C\) after the coupon.
Big Picture
What this problem is really about
Let C represent only the post-coupon granola-bar cost, then strip the story down to unit price, box count, and discount. The repeated box charge creates the subtotal, and the coupon reduces that completed subtotal once. Writing those roles in one equation keeps unrelated store details out and preserves the correct order of operations.
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