Book Maths Puzzle Percentage

25 stars 6 pair are binaries. friend and i say 48% are binaries, correct??

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Book Other Question

reena wants to fence part of her fromt yardfor a flower bed. What is the maximim area she can enclose with 30 m of fencing?

Im never sure how to answer these typoes of questions what is/are condition(s) for equality of two linear equation.