exam Maths Puzzle Numerical Ability

Number 6: Phil can furnish the garage in 12 hours, and Rick can do it in 10 hours. They work together for 3 hours. How long will it take Rick to finish the job alone?

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exam Other Question

Of all possible quotients of the numbers 10, -1/2, -5, and 1/5 which tow produce the largest quotient? Which two produce the smallest? Solve by using addition or substitution.If a unique solution does not exist, state whether it is inconsistant or dependant.
10x+2y=7
y=-5x+3

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