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8. Ratio and Proportion
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Q75 of 89 Page 120

A typist has to type a manuscript of 40 pages. She has typed 30 pages of the manuscript. What is the ratio of the number of pages typed to the number of pages left?

Total pages of manuscript to type = 40

Total typed pages = 30


Total left pages = 40 – 30 = 10


Ratio of the number of pages typed to the number of pages left =


Ratio = 3:1


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73

Find two numbers whose sum is 100 and whose ratio is 9 :16.

74

In Fig. 8.6 (i) and Fig. 8.6 (ii), find the ratio of the area of the shaded portion to that of the whole figure:


76

In a floral design made from tiles each of dimensions 40cm by 60cm (See Fig. 8.7), find the ratios of:

a) the perimeter of shaded portion to the perimeter of the whole design.


b) the area of the shaded portion to the area of the unshaded portion.


77

In Fig. 8.8, what is the ratio of the areas of

a) shaded portion I to shaded portion II?



b) shaded portion II to shaded portion III?


c) shaded portions I and II taken together and shaded portion III?

Questions · 89
8. Ratio and Proportion
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