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Direct and Inverse Proportions

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Mathematics

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Mathematics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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If we fix time period and the rate of interest, simple interest changes proportionally with principal. Would there be a similar relationship for compound interest? Why?


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Following are the car parking charges near a railway station upto


Solution: We have:

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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?


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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.


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Observe the following tables and find if x and y are directly proportional.

(i)

X

20

17

14

11

8

5

2

y

40

34

28

22

16

10

4

(ii)

X

6

10

14

18

22

26

30

y

4

8

12

16

20

24

28

(iii)

X

5

8

12

15

18

20

y

15

24

36

60

72

100


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