The average of x and y is 7.7,the average of y and z is 5.5 and the average of x and z is 6.6.what is the sum of x, y and z? ​

Answers

• Réponse publiée par: reyquicoy4321

  answer:

  15.4

  step-by-step explanation:

  formulate the 3 formula according to getting the average:

  

  x+y=7.7(2)

  x+y=15.4

  

  y+z=5.5(2)

  y+z=11

  

  x+z=6.6(2)

  x+z=13.2

  elimination method

  x+y=15.4

  -z-y=-11

  x-z=4.4

  now derived for x value

  x=z+4.4

  substitute the x value to x+z=13.2

  (z+4.4)+z=13.2

  remove parenthesis

  z+4.4+z=13.2

  2z = 13.2 -4.4

  2z = 8.8

  divide by 2

  x=4.4

  now exaluate the other formula

  x+y=15.4 (from above)

  4.4+y=15.4

  y=15.4-4.4

  y=11

  y+z=11

  11+z=11

  z=11-11

  z=0

  now for what is being ask

  "sum of x, y and z"

  4.4+11+0=15.4
• Réponse publiée par: snow01

  answer:

  answer:(Q.1) (2/9+(-3/11)*(5/2+7/8)

  answer:(Q.1) (2/9+(-3/11)*(5/2+7/8) =(22-27/99)*(20+7/8)

  answer:(Q.1) (2/9+(-3/11)*(5/2+7/8) =(22-27/99)*(20+7/8) = -5/99*27/8

  answer:(Q.1) (2/9+(-3/11)*(5/2+7/8) =(22-27/99)*(20+7/8) = -5/99*27/8 = - 135/792
• Réponse publiée par: Jelanny

  answer:

  cannot be

  step-by-step explanation:

• Réponse publiée par: stacy05

  Uhm, maybe square roots? not sure what you mean but