exam Maths Puzzle Numerical Ability

=22/the circumference of a circle is 132 yds find the radius using pie 7

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exam Other Question

what does the comma mean between the two fractions? and how would i solve it?

64. 4/x-y , 5x/2y-2x what was the percentage increase in the mean population from 1950 2,556,000,00 and 2000 6,279,000,000