book Maths Puzzle Numerical Ability


hi
i want to ask that how can i find the sum of the equations like
1*+2*+......+n* where * = 2

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book Other Question
A rectangle has a diagonal whose length is x. The rectangle is twice as long as it is wide. What is the area of the rectangle in terms of x? if a certain number is dubled and the result is increased by7, the number obtained is 19. What is the original number?