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Question
The actual length of a painting was 2 m. What is its length in the photograph if the scale used is 1 mm : 20 cm.
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Solution
The actual length of the painting was 2 m or 2 × 100 = 200 cm ...[∵ 1 m = 100 cm]
Scale used in the painting = 1 mm : 20 cm
Hence, length of painting in photograph = Scale × Actual size ...`[∵ "Scale" = "Size drawn"/"Actual size"]`
= `1/20 xx 200`
= 10 mm
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