Question Answers

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 - [...]

64. The variable x varies directly as y and x = 80 when y is 160. What is y when x is 64? 64. The variable x varies directly as y and x = 80 when y is 160. What is y when x is 64? August 5, 2021 Category: Chapter 13 - Direct and [...]

63. If x varies inversely as y and x = 20 when y = 600, find y when x = 400. 63. If x varies inversely as y and x = 20 when y = 600 find y when x = 400. August 5, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths [...]

62. (i) The quantity of rice and its cost. (ii) The height of a tree and the number of years. (iii) Increase in cost and number of shirts that can be purchased if the budget remains the same. (iv) Area of land and its cost. (v) Sales Tax and the amount of the bill. 4. [...]

61. (i) Number of students in a hostel and consumption of food. (ii) Area of the walls of a room and the cost of white washing the walls. (iii) The number of people working and the quantity of work. (iv) Simple interest on a given sum and the rate of interest. (v) Compound interest on [...]

60. (i) The time taken by a train to cover a fixed distance and the speed of the train. (ii) The distance travelled by CNG bus and the amount of CNG used. (iii) The number of people working and the time to complete a given work. 4. The number of teeth and the age of [...]

59. The area of cultivated land and the crop harvested is a case of direct proportion. 59. The area of cultivated land and the crop harvested is a case of direct proportion. August 5, 2021 Category: Chapter 13 - Direct and Inverse Proportions , Maths , NCERT Class 8 ,