exam Maths Puzzle Numerical Ability

Can someone please tell me what a Quartile 3 is and how you find it in a problem? Thanks

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exam Other Question

I think this is another word problem can someone help me?
(a) If you are given two sides of a triangle and the included angle, how would you find the third side?
(b)If you know
Find values for m and b in the following system so that the solution to the system
is (-3, 4).
5x +7y = b
mx + y = 22