3/A For sure
I'm guessing 4/D, 2/C 1/B?
The last ones are very confusing.
A giant elliptical can contain 400 billion of stars
First we need to convert them into improper fractions
2 2/5= 12/5
6 4/5= 34/5
to divide fractions you flip the second one and multiply them
12 5 12
---- × ---- = -----
5 34 34
then simplify
12/34=6/17
the correct answer is 6/17
I hope I've helped!
