book Maths Puzzle Numerical Ability

Number problems.

You have at least $30 in change in your drawer, consisting of
dimes and quarters. Write an inequality that shows the different number of coins in your drawer.

Thank you!

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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 car started out from Memphis toward Little Rock at the rate of 60 km/h. A second car left from the same point 2h later and drove along the same route at 75km/h. How long did it take the second car to overtake the first car?