exam Maths Puzzle Numerical Ability

the radius of a circle is shown. wich method would you use to find the diameter of the circle?

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exam Other Question

Riza was 25 when her 1st son was born.Today, the sum of their ages is 105.How old is Riza and her son now?
The longest side of a right trangle is 3 less than twice the shortest side. The third side measures 12 inches. Find the length of the shortest side.