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Proportions and scale drawings: word problems
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Learn it A proportion says two ratios are equal. Set it up with matching units in the same positions, then cross-multiply.
Example: On a map, 1 cm = 25 km. Two towns are 7 cm apart.
- $\frac{1}{25} = \frac{7}{d}$.
- Cross-multiply: $d = 7 \times 25$.
- $d = 175$ km.
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