The average of sixteen number is 48. The average of the first six of these number is 45 and that of

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The average of sixteen number is 48. The average of the first six of these number is 45 and that of the last seven numbers is 53. The seventh and the eighth numbers are respectively 3 and 7 greater than the ninth number. What is the average of the ninth and seventh numbers? (a) 41.5 (b) 40.5 (c) 42 (d) 39

The average of 46 numbers is 50.5. The average of the first 25 numbers is 45 and that of the last 18 numbers is 56. The 28th number is 67. If the 26th and 27th numbers are excluded, then what is the average of the remaining numbers? (a) 51.5 (b) 50.4 (c) 50 (d) 51

The average of five numbers is 30. If one number is excluded, the average becomes 31. What is the excluded number? (a) 26 (b) 24 (c) 31 (d) 30

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