Book Maths Puzzle Percentage

At work, I had to take 75% off products and after working 8 hours my head became mush. I realized later wouldn't it be easier to just lets say the number is $ 5.69 and just divid

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The second angle of a triangle is four times as large as the first. The third angle is 5 degrees more than the sum of the other two angles. How do I find the the measurement of t Jon averages 30mph when he drives on the highway to his house and 50mph on the interstate. If both routes are the same length, and he saves 2 hours by traveling on the interstates, how far away is his house?

A farmer has 300ft of fencing and wants to enclose a rectangular area of 500ft square. What dimensions should he use? (p=2l+2w, A=l*w)