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Mathematics for IGCSE & O level - Ratio And Proportion (Section 1 - No. 28)

If the ratio of the sides of a rectangle is 4:9, and the perimeter is 52 cm, what is the length?
12 cm
18 cm
20 cm
24 cm

解释

2(4+9)=26. 52/26 = 2. So length is 9*2 = 18

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