exam Maths Puzzle Numerical Ability

Can someone please explain to me, how to solve this problem, Thanks!

27y^3 + 125 =

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exam Other Question

An isosceles right triangle is removed from each corner of a square piece of paper so that a rectangle remains. What is the lenght of a diagonal of the rectangle if the sum of the areas of the cut-off pieces is 200? A solution has a concentration of 10 milligrams of salt per cubic centimetre. Water is slowly added such that the concentration of salt is reduced by 20% every two hours. Determine