exam Maths Puzzle Numerical Ability

Textbook Walls and Smith
The population of a country doubled in 100 years, what was the exponential growth rate?

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exam Other Question

Please help! The length of a rectangle plus its width is 40m. The area is 336 square meters. How long is the longest side of the triangle? 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?