exam Maths Puzzle Numerical Ability

Find the multiplicative inverse of 2.25.

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Hiya!
I was hoping you guys could help me with this:

Use long division to find the quotiet and remainder when 2x^5 + x^4-x+1 is divided by 2x^2-x-1.

Thanks alot! A 60 mililiter solution has 50% acid. How much pure water is needed to get 30% acid?