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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:

    \frac{x+y}{2} =7.7

    x+y=7.7(2)

    x+y=15.4

    \frac{y+z}{2} =5.5

    y+z=5.5(2)

    y+z=11

    \frac{x+z}{2} =6.6

    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
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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 i...