book Maths Puzzle Numerical Ability

find the value of t of the following problem.
5t+7/2=3t+5/4+2t+3

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book Other Question

which of the numbers 51,81,and111 is a composite number? (P.S thank you so very much) Please help me on this problem.
The question states: What are the coordinates of the point that is on the y-axis 6 units above the x-axis? Is it:

A)(0,-6) B) (0,6) C)(6,0)