book Maths Puzzle Numerical Ability

word problem

accountant A can balance books twice as fast as accountant B. Together it takes 6 hours to complete a job. How long would it take A to complete the job alone?

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Four gallons of pure iodine are added to 46 gallons of 2% iodine. How much of the final solution do you have?How much iodine is contained in the mixture? What is the strength(perce Tina wants to save money for school. Tina invests $400 in an account that pays an interest rate of 8%. How many years will it take for the account to reach $5500? Equation is