book Maths Puzzle Numerical Ability

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?

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book Other Question
A=3.14(pie)r2,for 3.14(pie) Any help with this problem would be greatly appreciated



Rationalize the denominator:
2____
√[6] - √[5]



Thanks