exam Maths Puzzle Numerical Ability

You are starting a T-shirt business. your fixed costs are $5,000. It costs $11 to buy each shirt. You plan to sell the shirts for $16 each. Write the total cost function, revenue function, profit function. Find the break even point.

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exam Other Question

What is the maximum area of an eight-by-thirteen-inch sheet of paper that you can cover by using seven three-by-five-inch standard index cards? You may not tear, bend, fold, or ot Find K if the given system of equations has infinite no of solutions.
2x+ky=1+2y and kx+12y=3
(1)-4 (2)6 (3)Either (1) or (2) (4) none of these.

i have chosen (3). But theanswer givenis (2). How it could be..?? plz explain this...??