book Maths Puzzle Numerical Ability

9x^2=64
9x^2=squre rt of 64
9x^2=8

I am stuck after this

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book Other Question

How many gallons of a 20% juice drink should you mix with 10 gallons of 60% juice drink to obtain a 30% juice drink?

I don't have my work paper here. I came up with 10 gallons.
Make sure the final answer is simplified.


2/5+1/5 3/4+2/3 1/2-5/7 -12/7-3/14 5/8*4/10 2/9+5/3