book Maths Puzzle Numerical Ability

Dear tutor,

having trouble. What is radius or diameter of 36" circumference circle?

Thanks,

George Mooney

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book Other Question

A bag contains 7 apples and 5 oranges. If you select 6 pieces of fruit without looking, how many ways can you get six apples? The sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number. What is the number?