Book Maths Puzzle Numerical Ability Age Problem

[x] denotes the greatest integer value just below x and {x} its fractional value. The sum of ( [x]cube) and ({x} square) is -7.19 . Find x
(A)-2.03
(B)-1.97
(C)-2.97
(D)-1.7

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Book Other Question

There are two squares ,one larger than the other .The perimeter of the larger square is 44 more than that of the smaller square ,and the area of the larger square is 187 sq unit more than the area of the smaller.Find the sides of the squares. Find the sides of two squares ,which contain together 12.25 hectares ,the sides of the squares being in the ratio of 3:4.