exam Maths Puzzle Numerical Ability

the length of a rectangular field is 10 meters less than four times its width. it cost $1584 to put a fence around the field. If the fencing cost 4.80 per meter what is the area of the field?

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exam Other Question

3x -y =-7
x + y = -9
ok I think I need to rewrite the equation with y= 3(x-x)-7 A car radiator has a 6 liter capacity. If the liquid in the radiator is 40% antifreeze, how much liquid must be replaced with pure antifreeze to bring the mixture up to a 50% solu