having trouble doing these can you help?

8) 2n/5 + (n/6)

12) 3/54 + 1/54

14) 2 7/10 - 3 7/20
i started this one and got
2 14/20 - 3 7/20 then got stuck?

16) -1 2/3 + (-2 1/4)

can you explain how to do?

3 answers

8)
2n/5+ n/6
= 12n/30 + 5n/30
= 17n/30

14)
2 7/10 - 3 7/20
= 27/10 - 67/20
= 54/20 - 67/20
= -13/20

12) , how can you miss this one, it is much easier than all the ones you had correct in an earlier post?
3/54 + 1/54
= 4/54
= 2/27

try the others and let me know what you got.
sorry #12 is suppose to be:
3 /5y + 1 5/y
I GOT; -13/20

16) is

- 1 2/3 + (-2 1/4)
i got : -2 5/12

are these right?
#12, what happened to the y ?

check your typing of #12, is the second supposed to be a mixed fraction?

16.

-1 2/3 - 2 1/4
= -5/3 - 9/4
= -20/12 - 27/12
= - 47/12 or -3 11/12