What fraction with denominator of 80 is equal to 60/64?

    ?              60
 =  
   80             64

Here, all you have to do is find out 80 divided by 64 to find out how many times 80 would go into 64.

           .8
       
 80 I 64.0
        64 0

Now that you know the answer is .8 all you have to do is divide 60 by .8

          7.5  
                 Now move the decimal over by 1 space and you get 75
  .8 I 60.0
        56
       
           40

75      60
---  =  ---
80      64

Sorry this took so long and if it's a bit messy, but hope it helps! =)

75/80, because if u divide by 8, then multiply by 10, u get 75/80, your answer

40%=2/550=1/230=3/1056=14/25