exam Maths Puzzle Numerical Ability

2x+(x-24)=90 what does x equal?

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There is a circle that is shaded in, EXCEPT two 40 degree triangles in it cut out like a piece of pie. The radius of the circle is the square root of 3. I need to find the area of The upper Angel Falls, the highest waterfall on Earth, are 750 m higher than Niagara Falls. If each of the falls were 7m lower, the upper Angel Falls would be 16 times as high as Niagara Falls. How high is each waterfall?