exam Maths Puzzle Numerical Ability

Simplify: 3/4/4/5
Possible Answers:
A. 16/15
B. 15/16
C. 5/3
D. 3/5
I am coming up with 3/80, since that is not one of the possible answers then I think I need some assistance.
Thanks

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g^2-g-12/g^2-10g+24 divided by g^2-9/g^2-7g+6 i need help in these two problems..can someone explain them to me thanks

problem #1
find the future value of the ordinary annuity.
If R = $2,500, I = 5% interest compounded qu