exam Maths Puzzle Numerical Ability

please help me solve the following

-k(-2-3)-(-2)(-k-5)=-2-(-2k+4)+3 square root of -27

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exam Other Question

Hello. I have a problem that I dont understand and I was wondering if anyone could help me. I problem is:
cosxcscx + cosxSQRT2 = 0

I got as far as: tanx + cosxSQRT2 = 0

Any help would be greatly appreciated! How much water must be evaporated from 400 gallons of a 14% saline solution to get a 40% saline solution?