exam Maths Puzzle Numerical Ability

Mr. Reyes estimates he can do a job in 12 hours while Mr. Tan estimates he can do the same job in 15 hours. How long would it take them to finish the job if they work together?

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exam Other Question
State whether this is true or false and explain your answer.

A line may bisect a segment, but a segment may not bisect a line. How do you write the linear equation in slope-intercept form: 9x-7y=6