find the average of 3,5and 7
Answers
Answer:
Let the 7 numbers be (a, b, c, d, e, f, g)
That the average of these number is 9 means:
(a + b + c + d + e + f + g) / 7 = 9
(a + b + c + d + e + f + g) = (7 * 9) = 63 ——————— (1)
If the average of 3 of these numbers is 5 then let us take:
(a + b + c)/3 = 5
(a + b + c) = (3*5) = 15 ——————————————— (2)
If the total of the 7 numbers from (1) above is 63:
And the total of the 3 numbers from (2) above is 15:
Then the total of the remaining 4 numbers is 63 minus 15
63 - 15 = 48
Then 48/4 is the average of the other 4 numbers
Therefore, the average of the 4 numbers = 12
If the average of 7 numbers is 5, and the average of another 5 number is 7, what is the average of 12 numbers?
The average of a set of 3 numbers is 7 and the average of another set of 7 numbers is 3. What is the average of all 10 numbers together?
The average of five numbers is 7. When three new numbers are included, the average of the eight numbers becomes 8.5. What is the average of three new numbers?
What is the average of 5 and what number is 9?
If the average of four numbers is 8, and the average of eight other numbers is 6, what is the average of the twelve numbers?
(a+b+c+d+e+f+g)/7=9 [Given]
(a+b+c+d+e+f+g)=63 [Multiply both sides by 7]
(a+b+c)/3=5 [Given]
(a+b+c)=15 [Multiply both sides by 3]
(d+e+f+g)=(a+b+c+d+e+f+g)-(a+b+c) [Subtraction]
(d+e+f+g)=63-15 [Substitution]
(d+e+f+g)=48 [Subtraction]
(d+e+f+g)/4=48/4 [Divide both sides by4]
(d+e+f+g)/4=12 [Division]
Answer: 12
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Avg of 7 numbers = 9
Total of 7 numbers will be = 9 * 7 = 63
Avg of 3 of them is = 5
Total of those 3 will be = 3 * 5 = 15
Therefore the total of other 4 = 63 - 15 = 48
Ergo , avg of them = 48 / 4 = 12
Answer is 12
The average of 7 numbers is 9. So the total of the 7 numbers is 63.
The average of 3 of them is 5 and so the sum of the three numbers is 15.
Hence the sum of the remaining 4 numbers is 63–15 = 48 and so the average of the remaining 4 numbers is 48/4 = 12.
Check: Average of the 7 numbers = (3x5 + 4x12)/7 = (15 + 48)/7 = 63/7 = 9. Correct.
What is the average of these numbers 1, 2, 3, 4, 5, and 6?
The average of 5 numbers is 9 and the average of the last three numbers is 5. What is the average of the first two numbers?
What is the average of -1, -2, -3, -4, -5, -6, -7, -8, -9, and -10?
The average of 9 numbers is 7 and the average of 7 other numbers is 6. What is the average of all 16 numbers?
The average of six number is 4. If the average of two of these numbers is 12, what is the average of the other numbers?
The total sum the 7 number=7×9=63
The total sum of 3 number =3×5=15
The total sum of 4 number =63-15 =48 the average of 4 numbers= 48÷4 =12 Ans.
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Though there are various solutions already given for this question,I would like to give another way to solve it.
Since average of 3 of them is 5 and total average is 9 therefore other 4 numbers must be carrying extra (9–5)*3 =12 with them.
Hence, 12/4 =3 must be added equally to other 4 numbers so that they can neutralize the effect of 3 numbers which are lagging behind.
Therefore, average of other 4 must be 9+3=12.
7*9 = 56 and that’s the sum of all the numbers
3*5 = 15 is the sum of 3 particular ones
That means the sum of the other 4 is 56–15 = 41
The average of the 4 left over is 41/4 = 10¹/₄︎
We know that the total of all 7 numbers is 63 (7x9 = 63)
We know that the total of the first 3 is 15. (3x5 = 15)
Subtracting the total of the 3 from the total of the seven, we get 48. (63–15=48)
We know that the total of the last 4 numbers is 48, so we know their average is 12. (48/4=12)
Hi Farhat. The way to solve this is through totals. The 7 number must total 63 if their average is 9.
Similarly the total of the 3 numbers is 15.
So the total of the remaining 4 numbers is 63−15=48 . Therefore the average of those 4 numbers is 48/4=12 .
If the average of 7 numbers is 9, then their sum must be 63. If the average of 3 of them is 5, then the sum of those 3 must be 15. The sum of the other 4 numbers must be 63 - 15 = 48. The average of those other 4 numbers must be 48/4=12
First 7 numbers:9
9x7=63
Average of 3 of the numbers:5
3x5=15
63–15=48
48/ 4=12 avg for the other 4 numbers
The seven numbers: 3,5,7,9,11,13,15. Average of 3,5,7: 5 Average of 9,11,13,15: 12
No explanation —just guessed :-(
Total of 4 numbers =7×9-3×5 =63-15= 48
Average of Other 4NUMBERS =48÷4=12
Required Average is 12
7•9=63
3•5=16
63–15=48
48/4=12
The average of the other 4 is 12.
Step-by-step explanation:
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Answer:
5 is the answer
Step-by-step explanation:
at first , add 3 ,5 and 7(means 3+5+7)
then we find 15 , to find the average of 3,5 ,7
divide 15 by 3
so now answer is 5