The sum of square of two numbers is 80 and the square of their difference is 16. What is the product of the two numbers?

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If the length of a rectangle is increased by 120% and its width is decreased by 20% , What happens to the area of the rectangle?

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the average of 5 numbes is 40 . If 2 more numbers with an avearge of 21, are added to these numbers, What will be the average of the combined 7 numbers?

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