exam Maths Puzzle Numerical Ability

if amy can paint a house in 6 hours, and pat can paint the same houe in 4, and brian can paint the house in 7 how long would it take all of them o paint the house?

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exam Other Question

For the given pair of variables determine whether a is a function of b, b is a function of a, both, or neither.
1. a is the number of years of formal education of an adult living this question is from a wksht...can you still help me?
2x-y-z=2
-x+3y+z=-1
2x-4y-3z=-5

i started the problem and for y i got -5/7 and -32/7 for z...i dont think that is right