the average of 6 number is 30 if average of first 4 is 25 and that of last three is 35 the fourth number is
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For average numbers, first find the total number of points necessary to get the average stated in the problem.
Since the average of the first 6 numbers is 30, that would mean you could say each is 30 x 6 = 180 is the sum of the first 6 numbers. We do not know each of the first 6 numbers is 30, just that the sum of all of their numbers is 180.
The average of the first four is 25, so, likewise, 25 x 4 = 100 points are in the first four numbers.
That means the last 2 numbers total to 180 - 100 = 80.
The average of the last three numbers is 35 x 3 = 105.
Since the last two numbers sum to 80, we know the third to the last number is 105 - 80 = 25.
six numbers = ____ _____ _____ __25___ ______ _______
The third to the last number is the fourth number in the list, so your answer is 25.
Since the average of the first 6 numbers is 30, that would mean you could say each is 30 x 6 = 180 is the sum of the first 6 numbers. We do not know each of the first 6 numbers is 30, just that the sum of all of their numbers is 180.
The average of the first four is 25, so, likewise, 25 x 4 = 100 points are in the first four numbers.
That means the last 2 numbers total to 180 - 100 = 80.
The average of the last three numbers is 35 x 3 = 105.
Since the last two numbers sum to 80, we know the third to the last number is 105 - 80 = 25.
six numbers = ____ _____ _____ __25___ ______ _______
The third to the last number is the fourth number in the list, so your answer is 25.
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