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If a rectangle has a ratio of 3:5 and the shorter side is 15 centimetres, what will be the longer side?

Answer and explanation

Correct answer: 25 centimetres

The governing concept is proportional reasoning. In the ratio 3:5, the shorter side represents 3 equal parts. If 3 parts measure 15 cm, one part measures 15 ÷ 3 = 5 cm. The longer side represents 5 parts, so its length is 5 × 5 = 25 cm. Thus option B is correct; the other values do not follow the given ratio.

Related tags

ProportionRatioRectangleCalculationPrinciples Of ArtArt EducationClass 9 Mcq

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