To solve this, I would suggest turning all your fractions in decimal numbers because it’s much more easier to compare decimal numbers rather than fractions (in my opinion)!
⓵ But first off, you can already get rid of a few choices just by looking at the fractions :
11/20 is a little bit more than 50% right? Because 50% would be 10/20!
Which means than all the fractions presented that are below or equal to 50% aren’t good!
So b) 3/10 → is below 50% because 50% would be 5/10!
You also have d) ½ → is equal to 50% so not a good answer!
⓶ Now that we have only two options left, let’s just go ahead and convert the fractions in decimal numbers. To do so, you just need to do a simple division :
11 ÷ 20 = 0.55
So we are looking for an answer that is above 0,55!
→ a) 3 ÷ 4 = 0,75 ↠ GOOD ANSWER
→ c) 4 ÷ 5 = 0,8 ↠ GOOD ANSWER
So your final answer is that the fractions a) and c) are greater than 11/20!
There you go! I really hope this helped, if there’s anything just let me know! ☻