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    A sum of Rs.4.800 is divided between A. B and C such that the ratio of the share of A to the combined share of B and C is 3 : 5 and C receives 57\frac
    Question

    A sum of Rs.4.800 is divided between A. B and C such that the ratio of the share of A to the combined share of B and C is 3 : 5 and C receives 57\frac57​ of what A and B together receive. The difference (in Rs.) of A‘s share and B's share is:

    A.

    1,000

    B.

    800

    C.

    900

    D.

    850

    Correct option is B

    Given:

    Total sum = Rs. 4,800,

    Ratio of A's share to the combined share of B and C = 3 : 5,

    C receives 57\frac{5}{7}​ of what A and B together receive.

    Solution:

    A's share in terms of B and C

    Let the combined share of B and C = 5x,

    Then, A's share = 3x (since the ratio of A's share to the combined share of B and C is (3 : 5))

    Total sum = A's share + B's share + C's share:

    3x + 5x = 8x

    8x = 4,800

    x = 4,8008\frac{4,800}{8}​ = 600

    A's share = 3x = 3 ×\times​ 600 = 1,800,

    Combined share of B and C = 5x = 5 ×\times​ 600 = 3,000

    C's share in terms of A and B.

    C receives 57\frac{5}{7}​ of what A and B together receive.

    A and B together receive:

    A's share + B's share = 1,800 + B's share

    C's share = 57×\frac{5}{7} \times (1,800 + B's share)

    B's share + C's share = 3,000

    B's share + 57×\frac{5}{7} \times​ (1,800 + B's share) = 3,000

    7 ×\times​ B's share + 5 ×\times​ (1,800 + B's share) = 21,000

    7B + 9,000 + 5B = 21,000

    12B + 9,000 = 21,000

    12B = 12,000

    B = 1,000

    C's share = (57(\frac{5}{7}× \times​ (1,800 + 1,000)):

    C's share = 57×\frac{5}{7} \times​ 2,800 = 2,000

    A's share = Rs. 1,800,

    B's share = Rs. 1,000,

    Difference:

    1,800 - 1,000 = 800  

    Alternate Method: 

    C is not equal So that first equal C 

    C = 35x , b =  21x , a = 25-21 = 4x 

    Total A+B+C =  10x + 14x = 24x 

    24x = 4800 

    x = 200 

    Difference 

    A - B = 9x - (14x-9x) 

    A - B = 9x - 5x   

    A - B = 4x 

    4x = 200×4\times4​  

    = 800

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