exam Maths Puzzle Numerical Ability

Find the sum of the first five terms of the series
1 + 8 + 64 + 512 + .......

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exam Other Question

The width of a rectangle is 2 less than twice its length. If the area of the rectangle is 125 cm , what is the length of the diagonal? Solve each system by the addition method:

3/7x+5/9y=27

1/9x+2/7y=7