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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exam Other Question
1) 1/A=1/M+1/T solve for T
I thought my LCD was AMT but its still not coming out right.
If someone could help thanks. Does the line below pass through the point (2, -1)?

3x - 2y = 8