exam Maths Puzzle Numerical Ability

a,b and c can finish a job in 6 days. if b and c work together , the job will take 9 days, if a and c work together the job will take 8 days in how many days can each man working alone do the job? please show formula

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Before Starting her vacation Sari's car had 23,500 miles on the odometer. She drives an average of (m) Miles each day for two weeks. Write an expression that represents the mileage Can you please explain how to do this problem. the abosolute value of x-2 is less than or equal to 9. The answer is x is less than or equal to 11 or x is greater than or equal to -7. How do you get these?