20/15 is an imporoper fraction which means that numerator is larger than the denominator 
It can be further simplified
fractions can be simplified by finding the highest common factor for both 15 and 20 and dividing the numerator by the highest common factor 
factors for 15 and 20 are as follows
 15 - 1,3,5,15
20,-,1,2,4,5,10,20
the greatest common factor is 5
so divide both by 5

this can be written as a proper fraction 
in 4/3 there's one whole number and 1/3 remaining
so anwer is 
