book Maths Puzzle Numerical Ability

Locate 10 between consecutive perfect-square integers

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book Other Question

Solve by Factoring:

x^2-9x=-20
x^2-9x+20=0
x^2-4x-5x+20=0
x(x-4)+(-5)(x-4)=0
(x-5)(x-4)=0
(x-5) or (x-4)
x=5 or x=4
Is this Correct? Thank you a vending machine has $41.25 in it. there are 255 coins total and the machine only accepts nickels,dimes and quarters. there are twice as many dimes as nickels.how many of each coi