Book Maths Puzzle Percentage

What is the fastest and easyest way to slove this problem.

How many liters of water must be added to 8 liter or a 40% acid solution to obtain a 10% acid solution?




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the sides of his rectangled yard is 12'x9'. the pool is trisected in the rectangle. what is the perimeter of the pool? in the picture the pool is shaded
in . its like the 4 corn
A bridge over a river has a parabolic shaped opening over the water. The underside of the bridge is determined by " y = 12 + 4x - xsquared ". A support girder on one end of the bri