Can you help me answers this maths question?

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6 Answers

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  • Alan
    Lv 7
    1 month ago
    Best Answer

    The last problem 31 only

    Design- Construction| = 2

    |Design - Evaluation| = 11

    From now on , I will call the variable by their 1st letter

    max value = 20 any section

    Design is the highest since it has largest difference

    Evaluation is the lowest

    D + C + E + R = 48

    D -C = 2

    D - E = 11

    2< D- R < 11

    C =D -2

    E = D -11

    Now , substituting value for C and E into 1st equation gives

    D + D -2 + D -11 + R = 48

    3D -13 + R = 48

    3D +R = 61

    Just based on the rules given so far,

    you can determine min and max values

    D_max = 20

    C_max = 18

    E_Max = 9

    E_min = 0

    D_min = 11

    C_min =9

    3*11 + R =61

    R = 61 -3*D

    so R<= 17

    R_max <= 17 since is not one of the top two

    R_max = 61-3*D

    But R is a max when D is a minimum

    3*D_min = 61 -R_max

    3*D_min = 61 -17 = 44

    3*D_min = 44

    D_min = 44/3 = 14.66666667

    But D is a whole number so

    D = 15,16,17,18, 19, or 20

    so try all 6 values for D from 20 down to 15

    so if D = 20

    D = 20 , C= 18 , E = 9

    R = 61 - 3*20 = 1

    Not possible since R > E

    D = 19 , C = 17 , E = 8

    R = 61 - 3*19 = 4 (still less E, so no

    D = 18, C = 16 , E =7

    R = 61 -3*18 = 7 (so equals E , so no)

    D= 17 , C = 15, E = 6

    R = 61 -3*17 = 10 (yes, a possible answer

    so the order is correct, the smallest difference is 2,

    and largest is 11 )

    D> C> R > E (meets that requirement)

    D = 16 , C = 14 , E = 5

    R = 61- 3*16 = 13 (The order is correct, but the smallest difference is 1 ,

    so no

    D = 15 , C =13 , E= 4

    R = 61 - 3*15 = 16 (no R is bigger than both D and C )

    so the correct set of number is :

    D = 17, C=15, E = 6 and R = 10

    so the answer is A) R = 10

    • Alan
      Lv 7
      2 weeks agoReport

      Probably not from "strs" since I am not sure what that
      is

  • 1 month ago

    Bruno was awarded 48 marks out of 80 for his coursework project. The maximum mark available for each of the four sections: research, design, construction and evaluation, was 20. The marks for all sections were expressed in whole numbers.

    The smallest difference between the marks awarded to any two of Bruno's sections was 2. This was between design and construction, which were his two best sections. The largest difference was 11, between design and evaluation.

    How many marks were Bruno's research section awarded?

    research (12), design (15), construction (17), and evaluation (4).

    Answer choice:

    C 12

    • Alan
      Lv 7
      1 month agoReport

      No, then, the largest difference would be 13 not 11.
      17-4 = 13 (not 11 )

  • SG
    Lv 5
    1 month ago

    I can't even read the problem.

  • poldi2
    Lv 7
    1 month ago

    Sorry, I am not going to copy/paste your blurry sideways image into a graphics program just so I can read your homework for you.

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  • Lisa A
    Lv 7
    1 month ago

    I'm not going to help you with your homework if it is blurry and sideways.

    • syed1 month agoReport

      Sorry took the picture upright don’t know what happened 😩

  • Jay
    Lv 6
    1 month ago

    Yeah, of course I "can", and so "can" everyone else.

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