exam Maths Puzzle Numerical Ability

Here is my question: I am suppose to find the population growth with this equation; P=8t^2=Po the population is 1000 and need to get what each year's growth would be from 2010 to

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Write each number in the form a/b using integers to show that this a rational number. The numbers are 0.2, 21.3 and -4. One pump can fill a water tank in 25 minutes. Another pump can fill the same tank in 50 minutes. If the first pump is open for 5 minutes before the second is opened, how long will it take to fill the tank?