exam Maths Puzzle Numerical Ability

6x-4(2x+1)=12

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exam Other Question

Complete the ordered pairs so that each is a solution for the given equation.
y =-2x + 5 (0,5), (0,5), (3/2,2), (2,1) Bob can do a job in 1 hour, John can do the same job in 2 hours, Lisa can do the same job in 3 hours. How long would the job take if they all work together?