exam Maths Puzzle Numerical Ability

Please explain how you would find the sum of the first 50 even numbers. What is the sum?

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exam Other Question

Two men went fishing. They caught a total of 36 fish. X caught 8 times more than Y, how many fish did Y catch? Can someone help me with this problem?

I need to find the first and third quartiles, Q1 and Q3, of the following set of numbers:

13,7,15,13,13,12,9,11,19,9

Thanks,
Sher