book Maths Puzzle Numerical Ability

A=3.14(pie)r2,for 3.14(pie)

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book Other Question

If the sides of a square are lengthened by 4cm, the area becomes 256 square cm. Find the length of a side of the original square.
Thank you Darren worked 28 hours at $3.15 per hour. He made the following tips $18. $16, $20, $30 and $18. what is his average hourly wage?