exam Maths Puzzle Numerical Ability

If Kenya has a population of 20,000,000 people and doubling time of 16 years and if the growth continues at the same rate, find the population in 22 years.

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i need help now You have a 10 cm cube and you cut the cube into 1 cm pieces, what is the largest cube you can build that looks solid from the outside but is hollow on the inside, and how many pieces would be left over?