Sum of eight consecutive odd numbers is 656. Average of four consecuti...
odd numbers — x-8, x-6, x-4, x-2, x, x+2, x+4, x+6
x-8 + x-6 + x-4 + x-2 + x + x+2 + x+4 + x+6 = 656
8x – 8 =656
x = 83
Even numbers — y-2, y, y+2, y+4
4y + 4 = 87 * 4
y = 86
sum of the largest even number and odd number = 89 + 90 = 179
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Sum of eight consecutive odd numbers is 656. Average of four consecuti...
Given information:
- Sum of eight consecutive odd numbers is 656.
- Average of four consecutive even numbers is 87.
We need to find the sum of the largest even number and largest odd number.
Solution:
Let's start by finding the eight consecutive odd numbers whose sum is 656.
Let the first odd number be x.
Then, the second odd number will be x + 2.
Similarly, the third odd number will be x + 4, and so on.
The eight consecutive odd numbers will be:
x + (x + 2) + (x + 4) + (x + 6) + (x + 8) + (x + 10) + (x + 12) + (x + 14)
Simplifying the above expression, we get:
8x + 56 = 656
8x = 600
x = 75
Therefore, the eight consecutive odd numbers are:
75, 77, 79, 81, 83, 85, 87, 89
Next, let's find the four consecutive even numbers whose average is 87.
Let the first even number be y.
Then, the second even number will be y + 2.
Similarly, the third even number will be y + 4, and so on.
The four consecutive even numbers will be:
y + (y + 2) + (y + 4) + (y + 6)
Simplifying the above expression, we get:
4y + 12 = 348
4y = 336
y = 84
Therefore, the four consecutive even numbers are:
84, 86, 88, 90
Finally, we need to find the sum of the largest even number (90) and largest odd number (89).
Sum = 90 + 89 = 179
Hence, the answer is option E (179).
Sum of eight consecutive odd numbers is 656. Average of four consecuti...
Given:
- Sum of eight consecutive odd numbers = 656
- Average of four consecutive even numbers = 87
To Find:
- Sum of the largest even number and largest odd number
Solution:
Let's first find the eight consecutive odd numbers.
Let the first odd number be x.
Then the next seven odd numbers would be: x+2, x+4, x+6, x+8, x+10, x+12, x+14.
The sum of these eight odd numbers would be:
x + (x+2) + (x+4) + (x+6) + (x+8) + (x+10) + (x+12) + (x+14)
= 8x + 56
According to the question, this sum is equal to 656. So,
8x + 56 = 656
8x = 600
x = 75
Therefore, the eight consecutive odd numbers are:
75, 77, 79, 81, 83, 85, 87, 89
Now, let's find the four consecutive even numbers.
Let the first even number be y.
Then the next three even numbers would be: y+2, y+4, y+6.
The average of these four even numbers would be:
(y + y+2 + y+4 + y+6)/4 = 87
4y + 12 = 348
4y = 336
y = 84
Therefore, the four consecutive even numbers are:
84, 86, 88, 90
The largest even number is 90 and the largest odd number is 89.
So, the sum of the largest even number and the largest odd number would be:
90 + 89 = 179
Hence, the answer is option E (179).