The average of 100 numbers is 210. The average of these 100 numbers and 20 other new numbers is 200. What is the average of 20 new numbers?
The average of 13 numbers is 60. The average of the first 7 numbers is 57 and that of the last 7 numbers is 65. What is the 7th number?
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The average of 31 numbers is 57. The average of the first 10 numbers is 50 and that of the last 20 numbers is 61. What is the 11th number?
A class has three sections A, B and C and the combined number of students in all three sections of the class is 200. In a test, the average marks of all the students in the class is 95. The average marks of all the students of sections A and B is 80 and the average marks of all the students of section C is 104. What is the number of students in Section C?
The average weight of A, B and C is 50 kg. If the average weight of A and B is 45 kg and that of B and C is 59 kg, what is the weight of A?
The average weight of A, B, C and D is 64 kg. If the average weight of A and B is 50 kg and that of B, C and D is 70 kg, what is the weight of B?
The average of X natural numbers is 32. If 8 is added to the first number and 40 is subtracted from the last number, the average becomes 30. What is the value of X?
The average weight of a group of 15 persons increases by 2 kg when a person weighing 40 kg is replaced by Saurabh. What is the weight of Saurabh?
The average of X natural numbers is 20. If 40 is added to the first number and 4 is subtracted from the last number, the average becomes 22. What is the value of X?
The average weight of A, B and C is 72 kg. When D joins them, the new average becomes 68 kg. When E joins, A, B, C and D, the average of all five becomes 70 kg. What is the weight of E?
Six friends have an average height of 172 cm. A boy with height 152 cm leaves the group. What is the new average height of the group?
The average of 8 numbers 12, 19, 23, 7, ‘x’, 9, 26 and 13 is 16. What is the value of ‘x’?
198 videos165 docs152 tests

198 videos165 docs152 tests
