book Maths Puzzle Numerical Ability

I am new at Algebra i havent have PRe-algerbra they just move me and i am so nervous because i dont know anything about that can u help me.PLEASE.
THANKS!!!

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book Other Question

The package of a model car states that the ratio of the length of a real car is 1:25. What is the ratio of the amount of paint required to cover the model to the amount required to cover the real car? can some one please show me how to rationalize the denominator in this problem?
1 / 2 + radical x
thanks