exam Maths Puzzle Numerical Ability

please help me evaluate: sqr root 8 * sqr root 18
do we apply the multiplication first? sqr root 144 = 12

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exam Other Question

Soy bean 16% protein; corn meal 8% protein; How many pounds of each should be mixed together in order to get 320-lb mixture that is 11%protein. I have a question. I am supposed to find the GCF of each product.

(6y^2 - 3y) (y + 7)

I got 3y (3y + 7) when I worked it out but I am not showing a GCF could you please help me with this problem? Thanks