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If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ______ hours

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NCERT EXEMPLAR-DIRECT AND INVERSE PROPORTIONS -EXERCISES
  1. In case of inverse proportion a2b2

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  2. If the area occupied by 15 postal stamps is 60 cm^2, then the area occ...

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  3. If 45 persons can complete a work in 20 days, then the time taken by 7...

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  4. Devangi travels 50 m distance in 75 steps, then the distance travelled...

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  5. Two quantities x and y are said to vary directly with each other if fo...

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  6. When the speed is kept fixed, time and distance vary inversely with ea...

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  7. When the distance is kept fixed, speed and time vary directly with eac...

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  8. Length of a side of a square and its area vary directly with each othe...

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  9. Length of a side of an equilateral triangle and its perimeter vary inv...

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  10. If d varies directly as t^2 then we can write dt^2=k where k is some c...

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  11. If a tree 24 m high casts a shadow of 15 m, then the height of a pole ...

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  12. If x and y are in direct proportion, then (x – 1) and (y – 1) are also...

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  13. If x and y are in inverse proportion, then (x + 1) and (y + 1) are als...

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  14. If p and q are in inverse variation then (p + 2) and (q – 2) are also ...

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  15. If one angle of a triangle is kept fixed then the measure of the remai...

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  16. Direct variations if two quantities a and b vary with each other in su...

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  17. Inverse variation if two quantities x and y vary with each other in su...

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  18. If x varies inversely as y and when x = 6, y = 8, then for x = 8 the v...

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

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

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