book Maths Puzzle Numerical Ability

please find the lowest common denominator of 3/4 and 5/8 thank you

a. 32
b. 16
c. 8
d. 4

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I saw a similar problem posted but am not sure of the solution to this one. Can someone help?
16^3/2
I got the answer as 6, because 16 = 4^4 and 4 times 3/2 = 12/2 =6 am I right? If not can someone please explain? Thanks. Can you show me what the graph lookes like for the Inequality of x+y > 2? I alos need help on knowing what numbers to use in the t-chart to test the Inequality graph