Chapter 13 – Direct and Inverse Proportions

Example 7 : When two quantities x and y are in inverse proportion, then x/y is a constant. Example 7 : When two quantities x and y are in inverse proportion then x/y is a constant. August 3, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths , NCERT Class 8 ,

Example 6 : Side of a rhombus and its perimeter are in ______ proportion. Example 6 : Side of a rhombus and its perimeter are in ______ proportion. August 3, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths , NCERT Class 8 ,

Example 5 : If x and y are inversely proportional then _____ = k where k is positive constant. Example 5 : If x and y are inversely proportional then _____ = k where k is positive constant. August 3, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths , NCERT Class 8 [...]

Example 4 : Amrita takes 18 hours to travel 720 kilometres. Time taken by her to travel 360 kilometres is _______. Example 4 : Amrita takes 18 hours to travel 720 kilometres. Time taken by her to travel 360 kilometres is _______. August 3, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths [...]

Example 3 : Which of the following is in direct proportion? (a) One side of a cuboid and its volume. (b) Speed of a vehicle and the distance travelled in a fixed time interval. (c) Change in weight and height among individuals. (d) Number of pipes to fill a tank and the time required to [...]

Example 2 : A car covers a distance in 40 minutes with an average speed of 60 km per hour. The average speed to cover the same distance in 30 minutes is Example 2 : A car covers a distance in 40 minutes with an average speed of 60 km per hour. The average speed [...]

Example 1 : If x and y are directly proportional and when x = 13, y = 39, which of the following is not a possible pair of corresponding values of x and y ? Example 1 : If x and y are directly proportional and when x = 13 which of the following is [...]

11. A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same? 11. A school has 8 periods a day each of 45 minutes duration. How long would each period [...]

10. Two persons could fit new windows in a house in 3 days. (i) One of the persons fell ill before the work started. How long would the job take now? (ii) How many persons would be needed to fit the windows in one day? 7. Suppose 2 kg of sugar contains 9×10^6 crystals. How [...]

9. A car takes 2 hours to reach a destination by travelling at the speed of 60 km/hr. How long will it take when the car travels at the speed of 80 km/hr? 9. A car takes 2 hours to reach a destination by travelling at the speed of 60 km/hr. How long will it [...]