exam Maths Puzzle Numerical Ability

I have a question of how to minimize this problem...

Minimize w = y1 + y2 + 4y3
subject to : y1 + 2y2 + 3y3 (is greater than or equal to) 115

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exam Other Question

rewrite the expresion so that all exponents are positive

(-13)^-1 A field is in the shape of a rectangle.The ratio
of the length of the field to its width is 3 to 2. If the
perimeter of the field is 190 yards, what is the demensions
of the field?