6/10 is the answer you're looking for. They are basically the same answer! 6/10 just hasn't been reduced yet! Hope this helps!
Here's something that explains it a little better than me:
According to my calculations, the LCM of the two denominators is 10. Therefore, since 5 goes into 10 a total of 2 times, you would multiply the top and bottom of the first fraction by 2. And since 10 goes into 10 a total of 1 times, you would multiply the top and bottom of the second fraction by 1.
Step #2: Now that the denominators are the same, you can simply compare the numerators to determine which fraction is greater. Since the numerators are the same, 6/10 is equal to 6/10. Therefore the 1st entry (3/5) is equal to the 2nd entry (6/10).