51. The average height of 8 students is 152 cm. Two more students of heights 144 cm and 155 cm join the group. What is the new average height ?
52. The batting average of a cricket player for 30 innings is 40 runs. His highest score exceeds his lowest score by 100 runs. If these two innings are not included, the average of the remaining 28 innings is 38 runs. The lowest score of the player is
53. Aman sells two watches at 99 each. On one he get 10% profit and on the other he loses 10%. His net gain or loss percent is
54. If a person lost 8% by selling an article for Rs. 1,035, he bought the article for
55. A cycle merchant allows 25% discount on the marked price of the cycles and still makes a profit of 20%. If he gains rs. 360 over the sale of one cycle, find the marked price of the cycle.
56. If $$ 2x=3y = 4z$$, find x: y: z,
57. The ratio of the ages of A, B and C is 5 : 8 : 9. If the sum of the ages of A and C is 56 years, the age of B will be
58. A box contain 280 coins of one rupee, 50 paise and 25 paise. The values of each kind of coin are in the ratio of 8 : 4 : 3. The number of one rupee coins will be
59. Length of each equal side of an isosceles triangle is 10 cm and the included angle between those two sides is $$45^\circ$$. Find the area of the triangle.
60. Rita purchased a car with a marked price of rs. 2,10,000 at a discount of 5%. If the sales tax charged is 10%, find the amount she has to pay.
61. A shopkeeper sold an item for Rs. 1,800 at a discount of 10% and gained Rs. 200. Had he not given the discount, his gain would be
62. The sum of the squares of the digits of the largest prime number in two digits is
63. Find the number lying between 900 and 1000 which when divided by 38 and 57 leaves in each case a remainder 23.
64. Raju can do a piece of work in 20 days, while Ram can do it in 30 days. If both of them work at it. together, then the number of days in which they will be able to finish the work is
65. P is twice as good a workman as Q and together they finish a piece of work in 20 days. In how many days will P alone finish the work ?
66. A spherical ball of lead of radius 14 cm is melted and recast into spheres of radius 2 cm. The number of the small spheres is
67. Using the pic-chart answer the following :If the annual income of the family is 60,000, then the savings is
68. The equation of the graph shown here is
69. Image files can be sent along with the e-mail documents using
70. The invention of_______led to the generation of computers.
71. The commonly used safety fuse-wire is made of
72. At what temperature is the density of water the maximum ?
73. The linear expansion of a solid rod is independent of its
74. Cathode rays when obstructed by metal cause emission of
75. In a_____network, all devices are connected to a device called a hub and they communicate through it.
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If the annual income of the family is 60,000, then the savings is 
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