book Maths Puzzle Numerical Ability

(3x2)(7x2)

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A conical pile of sand 6ft high has a base of 27 sq. ft. How many loads of sand are there in the pile(1load=1 cu. yard) the line 2x+3y=1 intersects the curve x(x+y)=10 at A and B.Calculate the coordinates of A and of B.