exam Maths Puzzle Numerical Ability

How would I go about multiplying this?

(2s + 5z)^2(s + 3z)^2

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exam Other Question

The sum of three numbers is 5. The sum of the first and second number is 3, and the first number is one more than three times the third number. How many of the numbers are even numbers? Oriana is 5 years older than her brother Francisco. The sum of their ages is 27. How old is each child?