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Answer

Since triangle ABC is equilateral, its interior angles are all 60 degrees.

Therefore, angle x = 360 – 90 – 124 – 60 = 86 degrees #

 

Let Andrew score A marks.

So, (A + 56 + 65)/ 3 = 64
A + 56 + 65 = 64*3 = 192
A = 192 – 56 – 65 = 71 #

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