book Maths Puzzle Numerical Ability

Put four different numbers in a circle so that when you add the numbers at the end of each line you always get a square number.
( where circle in the figure represents each of the

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book Other Question

if x < -1 then /x/ _ 1 A family plans to surrond their pool with a patio of constant width. The pool has an area of 150 square feet. The dimensions of the pool with the patio will be 15 feet by 20 feet. Find the dimensions of the pool.