book Maths Puzzle Numerical Ability

what is the definition of rational numbers and irrational numbers?

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A total of 10 pounds of apples and grapes costs $12.30. The apples cost $1.29 per pound and the grapes costs $1.19 per pound. How many pounds of apples are there? 1080264388e^.14x=1306313812e^.058x

this ? has to do with populations and im am trying to figure out when the 2 countrys will have the same population. the small numbers are grow