Book Maths Puzzle Algebra

Systems of Equations

x+y=4y
2x-y=30

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Book Other Question

$1783.00 is what percentage of $41,366.69? How to evaluate the expression and round to two decimal places?(1.49)(-0.5)
How to evaluate the expression in simplest fotm if not possible, why?
15/32 divided (-5/4) these are