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B. Fill in the blanks.

1. A ratio in the simplest form is 2 : 9. If its consequent is 108, then its antecedent is ............. .
2. Mean proportional between 4 and 16 is ............... .

3. Ratio of 65 paise to `15 is ............... .
4. 0.9% = ............... : 1000.

5. A rectangle has ............... lines of symmetry.
C. Write ‘T’ for true and ‘F’ for false statement.
1. A circle has infinite lines of symmetry.

2. 55% of 550 kg is equal to 302.5 kg.
3. Profit or loss per cent is always calculated on S.P.

4. If t, s, and m are in continued proportion, then s is called the mean proportional.
5. There are ‘m’ girls and ‘t’ boys in a class. The ratio of the number of girls to the number of
boys in the class is m : (m + t).
D. Solve the following questions.

1. In the word ‘CUSHION’, find the letters that have both vertical and horizontal lines of
symmetry.
2. Express the following statements as ratio. Which of the two ratios is greater?

(a) The cost of one table which is `1180 to that of one chair which is `560.
(b) Distance between Delhi and Shimla which is 350 km to that of distance between Agra
to Jaipur which is 300 km.
3. 48% of a number is 984. Find 90% of this number.

4. Check whether the adjoining figure shows rotational symmetry or not.
Also, find the order of rotational symmetry.

5. The price of sugar has increased from `46 to `48. Find the percentage increase in the price.
6. Raman buys a mobile phone for `35,500 and its accessories for `2500. He sold it for `40,000.
Find his gain or loss per cent.

7. The ratio of length and breadth of a rectangular ground is 8 : 7. If the breadth is 105 m,
find its length.
8. Find the lines of symmetry of each of the following shapes.

(a) (b)

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