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Msaada wa haraka kwa wale wataalamu wa hesabu.

Discussion in 'Jukwaa la Elimu (Education Forum)' started by sulphadoxine, Dec 29, 2011.

  1. sulphadoxine

    sulphadoxine JF-Expert Member

    #1
    Dec 29, 2011
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    There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is?
     
  2. E=mcsquared

    E=mcsquared JF-Expert Member

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    Dec 29, 2011
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    Kwa walioko F1 muhula wa kwanza tu
    Solve simultaneously:
    A-10=B+10
    2(A+20)=B-20
     
  3. E=mcsquared

    E=mcsquared JF-Expert Member

    #3
    Dec 29, 2011
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    Kwa walioko F1 muhula wa kwanza tu
    Solve simultaneously:
    A-10=B+10
    2(A+20)=B-20
     
  4. Sanja

    Sanja JF-Expert Member

    #4
    Dec 29, 2011
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    Hili swali hata ukilipata cwezi toa hata zawadi ya big g. Ukitumia hata 1 min sio fair. Ok in A kuna 60stdnts. Nawewe tafuta wa B.
     
  5. Loreen

    Loreen Senior Member

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    Dec 29, 2011
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    uongo kabisa embu proove!
     
  6. MKOBA2011

    MKOBA2011 Senior Member

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    Dec 30, 2011
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    A-10=B+10
    2(A+20)=B-20.

    Not true it was suppose to be
    A-10=B+10
    2(B-20)=B-20.Then when you solve it you will get


    A - B=20 ....... (i)
    2B-40=B-20...... (ii)

    When we solve simultaneously we get

    From (ii) 2B-B=-20+40
    B=20
    Substitute the value of B in (i) to get the value of A which will be
    A-20=20
    A=20+20
    A=40

    But when we solve your simultaneously we are going to get the value of A as negative which contradicts for the number of people to be negative
     
  7. S

    Song'ito JF-Expert Member

    #7
    Dec 30, 2011
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    A-10=B+10------------------------(i)
    2(B-20)=A+20---------------------(ii)

    from equation (i) making A the subject

    A= B+20---------------------------(iii)

    putting (iii) in (ii)

    2(B-20)= (B+20) +20
    2B-40=B+40
    2B-B=40+40
    B=80------------------------------ (iv)

    putting (iv) in (iii)

    A=80+20=100-------------------(v)

    hence value of A=100 and B= 80

    That is to say kuna wanafunzi 100 room A na wanafunzi 80 room B
     
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