The mean of seven numbers is 21. Five of the numbers are 18, 23, 21, 17, and 19. One of the remaining numbers is 3/4 of the other remaining number. Find the two unknown numbers.
Answers
Answer 1
Answer:
mean of a set of numbers is
(sum of the values of the numbers in the set)/(how many numbers in the set)=mean
example
1,2,4
mean is
(1+2+4)/3=7/3
ok
mean of 7 numbers is 21
(7numbers)/7=21
"5 of them are 18,23,21,17"
(mentally do 7-5=2)
2 missing
"one of the remaining is 3/4 of other"
the 2 remaining is x and 3/4x
nmow we have
(18+23+21+17+19+x+3/4x)/7=21
add like terms
(98+1 and 3/4x)/7=21
mulitply everybody by 7
98+7/4x=147
minus 98 both sides
7/4x=49
multiply both sides by 4/7 to clear fraction (7/4 times 4/7=28/28=1, so 1x=x)
1x=196/7
x=28
the other number is 3/4 of this
3/4x=3/4*28=21
the 2 unknowns are 28 arnd 21
(sum of the values of the numbers in the set)/(how many numbers in the set)=mean
example
1,2,4
mean is
(1+2+4)/3=7/3
ok
mean of 7 numbers is 21
(7numbers)/7=21
"5 of them are 18,23,21,17"
(mentally do 7-5=2)
2 missing
"one of the remaining is 3/4 of other"
the 2 remaining is x and 3/4x
nmow we have
(18+23+21+17+19+x+3/4x)/7=21
add like terms
(98+1 and 3/4x)/7=21
mulitply everybody by 7
98+7/4x=147
minus 98 both sides
7/4x=49
multiply both sides by 4/7 to clear fraction (7/4 times 4/7=28/28=1, so 1x=x)
1x=196/7
x=28
the other number is 3/4 of this
3/4x=3/4*28=21
the 2 unknowns are 28 arnd 21
Answer 2
Answer:
16 you are so welcom
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Answers
In this number the 7 is worth 7 units
Therefore you would need to divide (inverse operation) to get the original number which would be 0.7.
Therefore you would need to divide (inverse operation) to get the original number which would be 0.7.
Answers
the sum of angle in the triangle = 180 °
so c = 180-(90+37)
c= 180-127
c= 53°
so c = 180-(90+37)
c= 180-127
c= 53°
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24/40x
A. 2/5x
B. 3/5x
C. 3/5
D. 4/5
Answers
first of all, it must have an x attached to it, C. and D. are wrong, simplify to get 3/5 which is the answer
B.72 ft²
C.88 ft²
D.96 ft²
Answers
the answer is C._88.FT^2 the formula 2(w*l+h*l+h*w)
I think the correct answer to your question is C 88 feet
Answers
Look at the picture.
The perimeter of the triangle:
The perimeter of the triangle:
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