book Maths Puzzle Numerical Ability

5z^2-4z+1=0
z^2-4/5z+1/5=0z^2-22/5z+(2/5)^2-(2/5)^2+1/5=0
z^2-22/5z+(2/5)^2=-1/25

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book Other Question

find three consecutive numbers whose sum is 126 coin collection worth $2.90 contains nickels, dimes, and quaters. There are three times as many dimes as there are nickels, and the number of quarters is 2 more than the number of nickels