Question
The average of five positive numbers is 56. If the first
number is three-fourth of the sum of the last four numbers, then the average of the last four numbers is:Solution
Average of 5 numbers =56 first number is three-fourth of the sum of the last four numbers. Now, Let the sum of last four numbers be 4x First number = 3x Sum of all the elements- 4x + 3x = 56 x 5 7x = 280 x = 40. The average of the remaining four numbers = 4x/4 = 40
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