Answered

Get personalized answers to your unique questions on IDNLearn.com. Get the information you need from our community of experts who provide accurate and thorough answers to all your questions.

A, B and C stand for 3 different numbers.
The mean of A and B is 40.
The mean of B and C is 35

A+B+ C

Calculate ALL their values.

Sagot :

ZackFryidn
The mean is x amount of numbers added together divided by x. Since both mean questions have only 2 numbers, you times 40 and 35 by 2 to reverse the question. 

40 X 2 = 80 = a + b. 
35 X 2 = 70 = b + c. 
100 = a + b + c

80 and 70 are quite close together.  Therefore, b would probably be around 40 - 60.  I used trial and error to work out the answer. 

b = 40
80 - 40 = 40.  
a = 40. 
70 - 40 = 30. 
c = 30. 
40 + 40 + 30 = 110. 
THIS ANSWER IS WRONG. 

b = 50. 
80 - 50 = 30. 
a = 30. 
70 - 50  = 20.
c = 20. 
50 + 30 + 20 = 100. 
THIS ANSWER IS CORRECT. 

a = 30
b = 50
c = 20
Olemakpaduidn
Mean of A & B :    (A+B)/2 = 40.  Cross multiply
A + B = 80.

Mean of B & C:      (B+C)/2 = 35.  Cross multiply
B + C = 70.

(A + B + C) = 100        Note A + B = 80.

Therefore C  = 100 - (A+B) = 100 - 80 = 20.
C = 20.

A = 100 - (B+C) = 100 - 70 = 30.
A = 30.

A + B = 80
30 + B = 80
B = 80 -30 = 50.

A = 30, B = 50, C = 20.
Thank you for using this platform to share and learn. Keep asking and answering. We appreciate every contribution you make. Thank you for visiting IDNLearn.com. We’re here to provide accurate and reliable answers, so visit us again soon.