exam Maths Puzzle Numerical Ability

Solve 2w(4w+1)=1

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A service station wishes to mix 40 L of a 78% antifreeze solution. How many litres of a 75% solution and a 90% solution should be used in forming the mixture? ( using two unknowns, write two equations and solve.) which equation of the line passes through (3,-2) and is parallel to y=2/3x?