exam Maths Puzzle Numerical Ability

how do i solve 1/3 x+ 3/4x=13
and
-2x + 4 > 12

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exam Other Question

A garden area is 30 ft long and 20 ft wide. A path of uniform width
is set around the edge. If the remaining garden area is 400 ft2, what is the width of the path?

Taken from Beginning Algebra 6th Edition Ch. 10 Pg.835 To whomever can assist, thank you!

If the total surface area of a right circular cylinder is 104(pie) square meters and a radius of the base is 4 meters long, find the height o