exam Maths Puzzle Numerical Ability

what was the percentage increase in the mean population from 1950 2,556,000,00 and 2000 6,279,000,000

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exam Other Question

=22/the circumference of a circle is 132 yds find the radius using pie 7 I have a couple quick questions.

1.)Divide (30b^3+20b^2+25b+41)/(5b+5)

2.)Subtract and simplify (7-x/x-6)-(7x-9/6-x)
I got 6x-2/x-6 is theis correct or does it simplify even