exam Maths Puzzle Numerical Ability

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

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f=z(p+b) divided by 8 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?