The ratio of incomes of C and D is 3 : 4 and their expenditures is 4 : 5. If the savings of C is one fourth of his income then what is the ratio of savings of C and D?

• 3x-4y=(1/4)3x=>(3/4)3x=4y
  9x=16y
  x/y=16/9
  so (3x-4y)/(4x-5y)
  =(3*16-4*9)/(4*16-5*9)
  =12/9
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