exam Maths Puzzle Numerical Ability

Anne has two solutions, one with 6% iron and one with 2% iron. How many liters of each solution should be mixed to create 16 Liters of a solution with 3% iron content?

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Please help me with these...thank you

The function, p(d) = 1 + d/33 gives the pressure, in atmospheres (atm) at a depth d in the sea (d is in feet). Note that p(0) = 1 atm, p(33
Not owning, need help...
err, its a function.
2x+y=6