exam Maths Puzzle Numerical Ability

Sketch the graph of a system with the following: x+2y<160, 3x+y<180, x>0, y>0.

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exam Other Question

one number is 4 less than 3 times a second number. If 3 more than twice the first number is decreased by the second, the result is 11. Find both numbers

please help me i need this tonight! Given a(b,c) is in quadrant 4 and b=24/25, find y?