<< Solution of NCERT Exercise 13.2 and 13.3Solution of NCERT Exercise 14.2 >>

Direct And Indirect Proportion

Exercise 1

1. Following are the car parking charges near a railway station upto

4 hours Rs 60

8 hours Rs 100

12 hours Rs 140

24 hours Rs 180

Check if the parking charges are in direct proportion to the parking time.

Answer: The charges are not increasing in direct proportion to the parking time because

proportion 1

2. A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of base that need to be added.

proportion 2
proportion 3

3. In Question 2 above, if 1 part of a red pigment requires 75 mL of base, how much red pigment should we mix with 1800 mL of base?

Answer: x1=1 and y1 = 75

X2 = ? and y2 = 1800

proportion 4

4. A machine in a soft drink factory fills 840 bottles in six hours. How many bottles will it fill in five hours?

Answer: x1=840 and y1=6

X2=? And y2=5

proportion 5

5. A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm. What is the actual length of the bacteria? If the photograph is enlarged 20,000 times only, what would be its enlarged length?

proportion 6

6. In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?

Answer: x1= 9 cm and y1 = ?

X2= 12 and y2 = 28

proportion 7

7. Suppose 2 kg of sugar contains 9 — 106 crystals. How many sugar crystals are there in (i) 5 kg of sugar? (ii) 1.2 kg of sugar?

proportion 8

8. Rashmi has a road map with a scale of 1 cm representing 18 km. She drives on a road for 72 km. What would be her distance covered in the map?

Answer: x1=1 and y1 = 18

X2 = ? and y2 = 72

proportion 9

9. A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time

(i) the length of the shadow cast by another pole 10 m 50 cm high

(ii) the height of a pole which casts a shadow 5m long.

Answer: x1 = 5.6, x2 = 10.5 and x3 = ?

Y1 = 3.2, y2 = ? and y3 = 5

proportion 10

10. A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5 hours?

Answer: x1= 14 and y1 = 25 minutes

X2 = ? and y2 = 300 minutes

proportion 11
<< Solution of NCERT Exercise 13.2 and 13.3Solution of NCERT Exercise 14.2 >>

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