exam Maths Puzzle Numerical Ability

2x + y > or = 0
2x + 3y > or = 16
x + 3y . or = 11
x < or = 20, y < or = 20

Min C=4x + 3y with contraints

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exam Other Question

Find Σ for the following set of numbers

-1/5, 2/5, -3/5, 3/5, 4/5, 1

Which is correct: (Can you show me how to solve)

a. 1
b. 1/5
c. 4/5
d. 2 Please help me solve this equation: {-2x^-5 y}{-3xy^6}/ {-6x^6 y^2}