exam Maths Puzzle Numerical Ability

33 1/3% of a number is 3 2/3. Find the number.

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exam Other Question

Please help me figure out how to do linear programming. My problem is :
maximize:x + 2y
constraints:x >/= 0
y >/= 0
x + 2y</=4
2x + y</=4 Factor.

56 - 15w + w^2

I would appreciate any help you can give.