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2015-04-05T02:12:51+05:30

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Number of gents = G
number of ladies = L
number of children = C
             G + L + C = 20,                 
  G, L, C are all in the range from 1 to 18.

Rs 20 =  G * 4 + 0.50 * L + 0.25 * C
           = 4 G  + 0.50 L + 0.25 ( 20 - G - L )
           = 5 + 3.75 G + 0.25 L
  15 = 3.75 G + 0.25 L
                  60 = 15 G +  L

Let G = 1,    then L = 45  and hence  it is not possible, as L <= 18
     G = 2 ,  then  L = 30  and hence, it is not possible, as L <= 18
     G = 4,  then  L = 0, hence it is not possible , as L >= 1

     G = 3,    then L = 15,    and then  C = 2.
  So gents get 3 * 4 = Rs 12 ,    Ladies get 15*0.50 = 7.50 Rs
  children get  Rs 0.25 * 2 = Rs 0.50

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