exam Maths Puzzle Numerical Ability

2/5x=8

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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 Please help!! I have tried this problem to no end. It is a tqake home homework, not out of a text book. Thanks, Laura

solve the given equation: (e^3)x^*e^x^2=e^10