NCERT Class 8

74. Find the values of x and y if a and b are in inverse proportion: a. 12 x 8 b. 30 5 y 74. Find the values of x and y if a and b are in inverse proportion: a. 12 x 8 b. 30 5 y August 5, 2021 Category: Chapter 13 - [...]

73. The mass of an aluminium rod varies directly with its length. If a 16 cm long rod has a mass of 192 g, find the length of the rod whose mass is 105 g. 73. The mass of an aluminium rod varies directly with its length. If a 16 cm long rod has a [...]

72. If a deposit of Rs 2,000 earns an interest of Rs 500 in 3 years, how much interest would a deposit of Rs 36,000 earn in 3 years with the same rate of simple interest? 000 earn in 3 years with the same rate of simple interest? 000 earns an interest of Rs 500 [...]

71. It is given that l varies directly as m. (i) Write an equation which relates l and m. (ii) Find the constant of proportion (k), when l is 6 then m is 18. 71. It is given that l varies directly as m. (i) Write an equation which relates l and m. (ii) Find [...]

70. A car covers a distance in 40 minutes with an average speed of 60 km/h. What should be the average speed to cover the same distance in 25 minutes? 70. A car covers a distance in 40 minutes with an average speed of 60 km/h. What should be the average speed to cover the [...]

69. Sobi types 108 words in 6 minutes. How many words would she type in half an hour? 69. Sobi types 108 words in 6 minutes. How many words would she type in half an hour? August 5, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths , NCERT Class 8 ,

68. A contractor undertook a contract to complete a part of a stadium in 9 months with a team of 560 persons. Later on, it was required to complete the job in 5 months. How many extra persons should he employ to complete the work? 68. A contractor undertook a contract to complete a part [...]

67. In a camp, there is enough flour for 300 persons for 42 days. How long will the flour last if 20 more persons join the camp? 67. In a camp there is enough flour for 300 persons for 42 days. How long will the flour last if 20 more persons join the camp? August [...]

66. If x varies inversely as y and y = 60 when x = 1.5. Find x. when y = 4.5. 66. If x varies inversely as y and y = 60 when x = 1.5. Find x. when y = 4.5. August 5, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths [...]

65. l varies directly as m and l is equal to 5, when m = 2/3 . Find l when m = 16/3 . 65. l varies directly as m and l is equal to 5 when m = 2/3 . Find l when m = 16/3 . August 5, 2021 Category: Chapter 13 - [...]