exam Maths Puzzle Numerical Ability

Given a(b,c) is in quadrant 4 and b=24/25, find y?

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exam Other Question

Sketch the graph of a system with the following: x+2y<160, 3x+y<180, x>0, y>0. If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80?