exam Maths Puzzle Numerical Ability

Oriana is 5 years older than her brother Francisco. The sum of their ages is 27. How old is each child?

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exam Other Question

How would I go about multiplying this?

(2s + 5z)^2(s + 3z)^2 Pls help me with this qn: One thousand cubes are arranged to form a large cube. All the surfaces of the large cubes are then painted. What fraction of the cubes are not painted at all?