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An image measures 40 centimetres by 60 centimetres. If the width is reduced to 20 centimetres while keeping the same proportion, what will the height be?

Answer and explanation

Correct answer: 30 centimetres

The governing concept is maintaining a constant scale factor. The new width is 20 ÷ 40 = 1/2 of the original width. To preserve the same proportion, multiply the original height by the same factor: 60 × 1/2 = 30 centimetres. Hence option B is correct. The other choices change the width-to-height relationship and would distort the image instead of reducing it proportionally.

Related tags

ProportionReductionDimensionsCalculationPrinciples Of ArtArt EducationClass 9 Mcq

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