book Maths Puzzle Numerical Ability

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?

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book Other Question

I have a string of Christmas lights that is 100 feet long, and, I want to hang it in the form of a rectangle that its length is, at least twice its width or more; what is the range what is the definition of rational numbers and irrational numbers?