Problem-Solving and Data AnalysisHardEnlarging a photo in proportion
Problem-Solving and Data Analysis practice question
A photograph measures 4 inches by 6 inches. It is enlarged so that its shorter side becomes 10 inches, keeping the same proportions. How long, in inches, is the longer side of the enlargement?
Answer: 15
The scale factor is 10/4 = 2.5, so the longer side is 6 × 2.5 = 15.
Common wrong answers
- If you answered 12
- 12 adds 6 to the shorter side's increase, treating the change as additive.
- If you answered 24
- 24 multiplies 6 by 4.
- If you answered 6.67
- 6.67 uses the ratio the wrong way round.
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