book Maths Puzzle Numerical Ability

If the sides of a square are lengthened by 4cm, the area becomes 256 square cm. Find the length of a side of the original square.
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book Other Question

Which system(s)of equations has no solution?
1. y = 3x - 1 and y = 3x + 1
2.x + y = 1 and y = -x + 3
3. y = 1.5x - 2 and y = 3/2 X + 2
4. 2X + Y = 4X + 2 A=3.14(pie)r2,for 3.14(pie)