exam Maths Puzzle Numerical Ability

The Quotient of 3b and 4.5

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exam Other Question

I am trying to find out the steps of how to get the answer to 2x + x + 1 = 2? Tom can do a job in 3 hours, Dick in 4 hours, and Harry in 6 hours. If they do it together (and do not delay each other), how long does the job take?