exam Maths Puzzle Numerical Ability

The area of a circle is twice its circumference. What is the area of the circle?

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need your help guys, can't come up with the right answer.

mark can row upstream at 5mph and downstream at 11mph. if mark starts rowing upstream and then rows downstream to his s Smplify the ff. complex rational expression:
1. 2 + x
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3
____________
x + 5
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7x