exam Maths Puzzle Numerical Ability

A boat takes twice as long to go 40 miles, it takes the boat 12mph in still water.
what is the equation?
How long is the round trip?

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Textbook Walls and Smith
The population of a country doubled in 100 years, what was the exponential growth rate? $866,666.67 round to the nearest whole percentages Using this model, estimate the percentage of participation that can be excepted if $3 million is spent on this recycling project?