exam Maths Puzzle Numerical Ability

Find the mean and the median.
-8, -1, 3, 9, 15, 18

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exam Other Question

Solve by the substitution method.

4x-5y = 21

5x+21= y It is a fact that if an N is a composite number, then there exists a prime
p is less than or equal to sqrt(N) which is a factor of N. Given this, how many primes must be checked to determine if 2003 is prime?
How did you come up with the answer?