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Equations from real-life problems
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Learn it Define the variable, write the equation from the story, solve, and answer the question that was asked (it may need one more step).
Example: 18 coins (quarters and dimes) are worth $\$3.30$. How many quarters?
- Let q = quarters; dimes = 18 − q.
- $25q + 10(18 - q) = 330$ → $15q + 180 = 330$.
- $15q = 150$, so q = 10 quarters.
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