exam Maths Puzzle Numerical Ability

A clothing manufacturer has some pure silk thread and some thread that is 85% silk. How many kilograms of each must be woven together to make 75kg. of a blend that is 96% silk?

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Joseph has 4 times as many quarters as he does dimes. If he has a total of $2.20, how many of each type of coin does he have? How do i solve y=0.5x+2 and -y=-2x+4 by systems of substitution?