exam Maths Puzzle Numerical Ability

Simplify and write with positive exponents 9x ( x^-3) / 18 x^15.

Thank you for your help.

Gabriel

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exam Other Question

Greta is making a cube with a surface area of 24 square feet.

If Greta triples the dimensions of the cube, what will the new surface area be? How many ounces of a 20% alcohol solution must be mixed with 5 ounces of a 50% alcohol solution to get a mixture that is 30% alcohol?

I have my first equation set up as 20% + 50% =30%
I then get confused and need help please.