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For fixed time period and rate of interest, the simple interest is directly proportional to the principal

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With a given rate of simple interest, the ratio of principal and amount for a certain period of time is 4 : 5. After 3 years, with the same rate of interest, the ratio of the principal and amount becomes 5: 7. The rate of interest per annum is

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NCERT EXEMPLAR-DIRECT AND INVERSE PROPORTIONS -EXERCISES
  1. If x varies inversely as y and when x = 6, y = 8, then for x = 8 the v...

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  2. The number of workers and the time to complete a job is a case of dire...

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  3. For fixed time period and rate of interest, the simple interest is dir...

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  4. Which of the following are in inverse proportion? (i) The number...

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  5. In the following questions, which of them vary directly and which vary...

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  6. In the following questions, which of them vary directly and which vary...

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  7. In the following questions, which of them vary directly and which vary...

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  8. If x varies inversely as y and x = 20 when y = 600, find y when x = 40...

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  9. The variable x varies directly as y and x = 80 when y is 160. What is ...

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  10. l varies directly as m and l is equal to 5, when m=2/3 Find l when m...

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  11. If x varies inversely as y and y = 60 when x = 1.5. Find x. when y = 4...

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  12. In a camp, there is enough flour for 300 persons for 42 days. How long...

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  13. A contractor undertook a contract to complete a part of a stadium in 9...

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  14. Sobi types 108 words in 6 minutes. How many words would she type in ha...

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  15. A car covers a distance in 40 minutes with an average speed of 60 km/h...

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  16. It is given that l varies directly as m. Write an equation which rel...

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  17. It is given that l varies directly as m. Find the constant of propor...

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  18. It is given that l varies directly as m. Find l, when m is 33.

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  19. It is given that l varies directly as m. Find m when l is 8.

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  20. If a deposit of Rs 2,000 earns an interest of Rs 500 in 3 years, how m...

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