Rearrange: \(0.2x = 10\).
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- Let \(x\) be the amount of 70% solution added.
- Equation: \(0.4 \times 100 + 0.7 \times x = 0.5 \times (100 + x)\).
- Simplify: \(40 + 0.7x = 50 + 0.5x\).
- Solve: \(x = 50\) mL.
- #### 50
- A rectangular garden is 15 meters long and 10 meters wide. A path 1 meter wide is built around it. What is the area of the path?
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