How many coins of 0.5 dollars each and 0.7 dollars each together make exactly 4.6 dollars?
(A)1, 6
(B)2, 7
(C)3, 5
(D)4, 3
(E)5, 3

• (E)5, 3
  
  By using we calculate that.
  
  5 *0.5 =2.5 dollars and 3 *.7=2.1 dollars
  Total = 2.5+2.1 = 4.6dollars
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• (E)
  0.5x+0.7y=4.6
  let y=k
  =>x=(4.6-0.7k)/0.5
  only when k=3,x becomes a natural number(x=5)
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• From option
  5*0.5=2.5dollar and 3*.7=2.1dollar
  totally 4.6 dollars...
  
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• 5,3.self explanatory.
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