exam Maths Puzzle Numerical Ability

the perimeter of rectangle 240 cm. its length is decreased by 10% & its breadth increased by 20 we get the same perimeter find the length & breadth of rectangle

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exam Other Question

what is the name given to part of a decanted mixture left behind in the vessel? Given -x to the third power + x to the second power + 3x + 4 find
f(�1), f(0), and f(1)

please help i am a little confused on what exactly to find