exam Maths Puzzle Numerical Ability

A firm decides to test its employees for illegal drugs. (a) State the null and alternative hypotheses.
(b) Define Type I and II error. (c) What are the consequences of each? Which

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An experienced accountant can prepare a tax return in 13 hours. A novice accountant can do the job in 20 hours. How long will it take them to do the job working together? If you mix 140mL of a 60% acid solution with 200 mL of a 30% solution you get a 40 mL of a _______% solution.